function checkDateOrder(frm, ci_day, ci_month_year, co_day, co_month_year) {
	if (document.getElementById) {
		var frm = document.getElementById(frm);
		// create date object from checkin values
		// set date to 12:00 to avoid problems with one
		// date being wintertime and the other summertime
		var my = frm[ci_month_year].value.split("-");
	    var ci = new Date (my[0], my[1]-1, frm[ci_day].value, 12, 0, 0, 0);
 
        // create date object from checkout values
	    my = frm[co_month_year].value.split("-");
	    var co = new Date (my[0], my[1]-1, frm[co_day].value, 12, 0, 0, 0);
 
		// if checkin date is at or after checkout date,
		// add a day full of milliseconds, and set the
		// selectbox values for checkout date to new value
	    if (ci >= co){
    	    co.setTime(ci.getTime() + 1000 * 60 * 60 * 24);
	        frm[co_day].value =  co.getDate();
    	    var com = co.getMonth()+1;
	        frm[co_month_year].value = co.getFullYear() + "-" + com;
    	}
	}
}

   function addzero( value )
   {
      while( value.length<2 ) value = String("0") + value;
      return value;
   }
   
   	function tickCheckBox(el) {
		if (document.getElementById) {
			if (document.getElementById(el)) {
				document.getElementById(el).checked = false;
			}
		}
		return true;
	}
 
	Date.prototype.getTwoDigitMonth = function () {
		// Returns a two-digit string from '01' to '12' representing the month property of a Date object.
		var month = (this.getMonth() + 1).toFixed().toString();
		if (month.length == 1) {
			month = '0' + month;
		}
		return month;
	};
 
	function checkDateOrder(me, ci_day, ci_month_year, co_day, co_month_year) {
		var
			frm = document.getElementById('frm'),
			my,
			ci = new Date( 0 ),
			co = new Date( 0 ),
			com,
			today = new Date();
		// create date object from checkin values
		// set date to 12:00 to avoid problems with one
		// date being wintertime and the other summertime
		if ( frm[ci_day].value !== '0' )
		{
			ci.setDate( frm[ci_day].value );
		}
		if ( frm[ci_month_year].value !== '0' )
		{
			my = frm[ci_month_year].value.split( "-" );
			ci.setFullYear( my[0] );
			ci.setMonth( my[1] - 1 );
		}
		ci.setHours( 12 );
		ci.setMinutes( 0 );
		ci.setSeconds( 0 );
		// create date object from checkout values
		if ( frm[co_day].value !== '0' )
		{
			co.setDate( frm[co_day].value );
		}
		if ( frm[co_month_year].value !== '0' )
		{
			my = frm[co_month_year].value.split( "-" );
			co.setFullYear( my[0] );
			co.setMonth( my[1] - 1 );
		}
		co.setHours( 12 );
		co.setMinutes( 0 );
		co.setSeconds( 0 );
		// If the new checkin date's month does not match
		// the current value of the dropdown, then it is
		// because the month was incremented creating an
		// invalid date (e.g. February 31st).
		// We'll cycle back the checkin date until we're in
		// the correct month.
		if ( frm[ci_month_year].value !== '0' )
		{
			while ( ci.getMonth() != frm[ci_month_year].value.split( "-" )[1] - 1 )
			{
				ci.setDate( ci.getDate() - 1 );
				frm[ci_day].value = ci.getDate();
			}
			var cim = ci.getMonth() + 1;
			frm[ci_month_year].value = ci.getFullYear() + "-" + cim;
		}
		// if checkin date is at or after checkout date,
		// add a day full of milliseconds, and set the
		// selectbox values for checkout date to new value
		if ( ci >= co )
		{
			co.setTime( ci.getTime() + Date.prototype.MILLISECONDS_PER_DAY );
			com = co.getMonth() + 1;
			if ( frm[ci_day].value !== '0' )
			{
				frm[co_day].value = co.getDate();
			}
			if ( frm[ci_month_year].value !== '0' )
			{
				frm[co_month_year].value = co.getFullYear() + "-" + com;
			}
		}
	}
 
	function updateDaySelect( me )
	{
		// 1-2 testing
		if ( !days3 )
		{
			return;
		}
		var frm = document.getElementById('frm');
		if ( frm.getAttribute( 'id' ) !== 'frm' && frm.className !== 'availForm' )
		{
			return;
		}
		// Check if we have all fields. If not, we are in the first stage
		// of the book process and should not auto-update selects since there
		// is only the check-in select and the amount of nights.
		if ( !frm.checkin_monthday || !frm.checkout_monthday || !frm.checkin_year_month || !frm.checkout_year_month )
		{
			return;
		}
		if ( frm.checkin_monthday.value === '0' && frm.checkout_monthday.value === '0' && frm.checkin_year_month.value === '0' && frm.checkout_year_month.value === '0' )
		{
			return;
		}
		// If the year-month fields have nonzero values, prepend the day of the week to each monthday in the check-in and check-out monthday Selects.
		var
			ci_d = frm.checkin_monthday,
			co_d = frm.checkout_monthday,
			ci_my,
			co_my,
			todaysDate;
		// If the form field has a nonzero value, use it;
		if ( frm.checkin_year_month.value !== '0' )
		{
			ci_my = frm.checkin_year_month.value.split( "-" );
		}
		else
		{
			// Use the current date value.
			todaysDate = new Date();
			ci_my = [ todaysDate.getFullYear(), todaysDate.getTwoDigitMonth() ];
		}
		if ( frm.checkout_year_month.value !== '0' )
		{
			co_my = frm.checkout_year_month.value.split( "-" );
		}
		else
		{
			todaysDate = new Date();
			co_my = [ todaysDate.getFullYear(), todaysDate.getTwoDigitMonth() ];
		}
		var
			ci_sel = Math.max( ci_d.selectedIndex, 0 ),
			co_sel = Math.max( co_d.selectedIndex, 0 ),
			ci_sel_value = ci_d[ ci_sel ].value,
			co_sel_value = co_d[ co_sel ].value,
			monthDays = [],
			opt,
			i;
	
		ci_d.innerHTML = '';
		co_d.innerHTML = '';
	
		var MonthdayPromptOption = function ()
		{
			this.option = {
				"_this" : this,
				"@selected" : "selected",
				"@class" : "day prompt site_experiment_encourage_date_entry_2",
				"@value" : 0,
				"#text" : "Day"
			};
		};
		if ( ci_sel_value === '0' )
		{
			buildHtmlNode( new MonthdayPromptOption(), ci_d ).selected = true;
		}
		if ( co_sel_value === '0' )
		{
			buildHtmlNode( new MonthdayPromptOption(), co_d ).selected = true;
		}
 
		function writeMonthdaysOptions( numberOfMonthdaysToShow, yearMonthSelectElement, monthDaysArray, monthDaysSelectElement, monthDaySelectValue )
		{
			var i, optionElementInnerHTML, optionElement;
			for ( i = 0; i < numberOfMonthdaysToShow; i++ )
			{
				optionElement = document.createElement( 'option' );
				optionElementInnerHTML = i + 1;
				if ( yearMonthSelectElement.value !== '0' )
				{
					optionElementInnerHTML = monthDaysArray[i] + ' ' + optionElementInnerHTML;
				}
				optionElement.innerHTML = optionElementInnerHTML;
				optionElement.value = ( i + 1 );
				if ( i > 0 && monthDaySelectValue == i + 1 )
				{
					optionElement.defaultSelected = optionElement.selected = true;
				}
				monthDaysSelectElement.appendChild( optionElement );
			}
		}
		// Check-in month
		monthDays = buildDaysForMonth( ci_my[0], ci_my[1] );
		var numberOfMonthdaysToShow = 31;
		if ( frm.checkin_year_month.value !== '0' )
		{
			numberOfMonthdaysToShow = monthDays.length;
		}
		writeMonthdaysOptions( numberOfMonthdaysToShow, frm.checkin_year_month, monthDays, ci_d, ci_sel_value );
		// Checkout month
		monthDays = buildDaysForMonth( co_my[0], co_my[1] );
		numberOfMonthdaysToShow = 31;
		if ( frm.checkout_year_month.value !== '0' )
		{
			numberOfMonthdaysToShow = monthDays.length;
		}
		writeMonthdaysOptions( numberOfMonthdaysToShow, frm.checkout_year_month, monthDays, co_d, co_sel_value );
		// IE 6 exhibits a bug whereby the value of the monthday select always jumps to zero.
		if ( document.all && !gClientIsOpera && /MSIE 6\.0/.test(navigator.appVersion) )
		{
			ci_d.value = ci_sel_value;
			co_d.value = co_sel_value;
		}
	}
 
	function buildDaysForMonth( year, month )
	{
		// Month index starts on 0(-11) in Date()-object
		var monthDate = new Date( year, month - 1 );
		var orgMonth = monthDate.getMonth();
		var dayArray = [], weekDay;
		while ( monthDate.getMonth() == orgMonth )
		{
			// Week starts on Sunday in Date()-object
			weekDay = ( monthDate.getDay() == 0 ) ? 6 : ( monthDate.getDay() - 1 );
			dayArray.push( days3[weekDay] );
			monthDate.setDate( monthDate.getDate() + 1 );
		}
		return dayArray;
	}
 
	function buildHtmlNode (elementsObject, targetNode, refChild)
	{
		/*
		Accepts an object of elements where the key specifies the tagname unless prefixed by @, in which case it specifies an attribute of the parent, or when it is #cdata, in which case it specifies a CDATA child.
		
		http://xml.com/pub/a/2006/05/31/converting-between-xml-and-json.html
		
		The big flaw now is the case <a><b/><c/><b/><a/>, which cannot be represented as a JS object. In that case interject an array of generic div or span elements.
		*/
		// If we want to validate as JSON, we must make sure what we pass in is JSON, which it presently isn’t.
		//elementsObject = booking.json.validate(elementsObject);
		var
			key,
			counter,
			found,
			newElement,
			newNode;
		for (key in elementsObject)
		{
			if (elementsObject.hasOwnProperty(key))
			{
				var
					prefix = key.substring(0, 1),
					primaryKey = key.substring(1);
				if (prefix != '_') // We’re on a non-DOM key, so skip.
				{
					if (prefix == '@') // Attribute
					{
						if (!targetNode.getAttribute(primaryKey))
						{
							// Perhaps extend this in the future to support multiple class values.
							targetNode.setAttribute(primaryKey, elementsObject[key]);
						}
					}
					else
					{
						if (prefix == '#') // Text or CDATA
						{
							if (primaryKey == 'text') // Text
							{
								found = false;
								if (targetNode.childNodes && targetNode.childNodes.length > 0)
								{
									// Traverse text node children and append only if it isn’t already there.
									counter = 0;
									while (counter < targetNode.childNodes.length && !found)
									{
										if (targetNode.childNodes[counter].nodeType == Node.TEXT_NODE && targetNode.childNodes[counter].nodeValue == elementsObject[key])
										{
											found = true;
										}
										counter++;
									}
								}
								if (!found)
								{
									// MGP 040209: Cope with strings split by linebreaks - need to insert <br> elements
									if ( elementsObject[key].indexOf("\n") == -1 )
									{
										newNode = document.createTextNode(elementsObject[key]);
										if (refChild)
										{
											targetNode.insertBefore(newNode, refChild);
										}
										else
										{
											targetNode.appendChild(newNode);
										}
									}
									else
									{
										// Found some linebreaks - split the string into component parts
										var newNodeParts = elementsObject[key].split("\n");
										// Loop through the parts, adding a linebreak after each one (except the last one)
										for ( var i = 0; i < newNodeParts.length; i++ )
										{
											// Check for the existence of a star rating in the text node
											if ( newNodeParts[i].match(/\d\*$/) )
											{
												// Found a star rating - extract the star
												lastSpace = newNodeParts[i].lastIndexOf(" ");
												newNodeString = newNodeParts[i].substring( 0, lastSpace );
												starImgSrc = '/static/img/icons/stars/' + newNodeParts[i].substr( lastSpace + 1, 1 ) + 'sterren-small.png';
											}
											else
											{
												newNodeString = newNodeParts[i];
												starImgSrc = '';
											}
											newNode = document.createTextNode(newNodeString);
											if (refChild)
											{
												targetNode.insertBefore(newNode, refChild);
												if ( starImgSrc )
												{
													newImg = document.createElement('img');
													newImg.setAttribute('src', starImgSrc);
													newImg.className = "stars";
													targetNode.insertBefore(newImg, refChild);
												}
											}
											else
											{
												targetNode.appendChild(newNode);
												if ( starImgSrc )
												{
													newImg = document.createElement('img');
													newImg.setAttribute('src', starImgSrc);
													newImg.className = "stars";
													targetNode.appendChild(newImg);
												}
											}
											if ( i < newNodeParts.length - 1)
											{
												// Add a <br>
												newBR = document.createElement("br");
												if (refChild)
												{
													targetNode.insertBefore(newBR, refChild);
												}
												else
												{
													targetNode.appendChild(newBR);
												}
											}
										}
									}
								}
							}
							else
							{
								if (primaryKey == 'cdata') // CDATA
								{
									targetNode.appendChild(document.createCDATASection(elementsObject[key]));
								}
							}
						}
						else // Element
						{
							// If targetNode was passed into this function, append the new child to it…
							if (targetNode)
							{
								// If elementsObject[key] is an array, we’ll create an element of type key for each array member.
								if (elementsObject[key].length > 0)
								{
									for (counter = 0; counter < elementsObject[key].length; counter++)
									{
										if (elementsObject[key][counter])
										{
											if (!elementsObject[key][counter]._node)
											{
												newElement = document.createElement(key);
												elementsObject[key][counter]._node = newElement;
												var r = counter + 1;
												while (r < elementsObject[key].length && !refChild)
												{
													if (elementsObject[key][r])
													{
														refChild = elementsObject[key][r]._node;
													}
													r++;
												}
												if (refChild)
												{
													newNode = targetNode.insertBefore(
														elementsObject[key][counter]._node,
														refChild);
												}
												else
												{
													newNode = targetNode.appendChild(
														elementsObject[key][counter]._node);
												}
												arguments.callee(
													elementsObject[key][counter],
													newNode);
												newElement._elementTree = elementsObject[key][counter];
											}
											else
											{
												arguments.callee(
													elementsObject[key][counter],
													elementsObject[key][counter]._node);
											}
										}
									}
								}
								else
								{
									if (elementsObject[key].length !== 0)
									{
										if (!elementsObject[key]._node)
										{
											newElement = document.createElement(key);
											elementsObject[key]._node = newElement;
											if (refChild)
											{
												newNode = targetNode.insertBefore(
													elementsObject[key]._node,
													refChild);
											}
											else
											{
												newNode = targetNode.appendChild(
													elementsObject[key]._node);
											}
											arguments.callee(
												elementsObject[key],
												newNode);
											newElement._elementTree = elementsObject;
										}
										else
										{
											arguments.callee(
												elementsObject[key],
												elementsObject[key]._node);
										}
									}
								}
							}
							// …else create the new element as targetNode.
							else
							{
								if (!elementsObject[key]._node)
								{
									arguments.callee(elementsObject[key],
										elementsObject[key]._node = targetNode = document.createElement(key));
								}
								else
								{
									arguments.callee(elementsObject[key],
										elementsObject[key]._node);
								}
							}
						}
					}
				}
			}
		}
		return targetNode;
	};