function getHeightFunction()
{
   var viewportwidth;
	 var viewportheight;
	 
	 // the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight	 
	 if (typeof window.innerWidth != 'undefined')
	 {
	      viewportwidth = window.innerWidth,
	      viewportheight = window.innerHeight
	 }
	 else if (typeof document.documentElement != 'undefined' && typeof document.documentElement.clientWidth != 'undefined' && document.documentElement.clientWidth != 0)
	 {
	 		// IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)
			viewportwidth = document.documentElement.clientWidth,
			viewportheight = document.documentElement.clientHeight
	 }
	 else
	 {
	 		// older versions of IE
			viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
			viewportheight = document.getElementsByTagName('body')[0].clientHeight
	 }

   document.getElementById('main').style.height = (viewportheight-145) + 'px';
}

var arVersion = navigator.appVersion.split("MSIE")
var version = parseFloat(arVersion[1])

if ((version >= 5.5))/* && (document.body.filters))*/
{
   for(var i=0; i<document.images.length; i++)
   {
      var img = document.images[i]
      var imgName = img.src.toUpperCase()
      if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
      {
         var imgID = (img.id) ? "id='" + img.id + "' " : ""
         var imgClass = (img.className) ? "class='" + img.className + "' " : ""
         var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
         var imgStyle = "display:inline-block;" + img.style.cssText
         if (img.align == "left") imgStyle = "float:left;" + imgStyle
         if (img.align == "right") imgStyle = "float:right;" + imgStyle
         if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
         var strNewHTML = "<span " + imgID + imgClass + imgTitle
         + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
         + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
         + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>"
         img.outerHTML = strNewHTML
         i = i-1
      }
   }
}

function checkLalalaForm()
{
	var formObj = document.forms['lalala'];

	if(isLeeg(formObj.elements['naam'].value))
	{
		alert("Er is geen naam ingevuld.");
		formObj.elements['naam'].focus();
		return false;
	}

	if(isLeeg(formObj.elements['straat'].value))
	{
		alert("Er is geen straat ingevuld.");
		formObj.elements['straat'].focus();
		return false;
	}

	if(isLeeg(formObj.elements['postcode'].value))
	{
		alert("Er is geen postcode ingevuld.");
		formObj.elements['postcode'].focus();
		return false;
	}

	if(isLeeg(formObj.elements['plaats'].value))
	{
		alert("Er is geen plaats ingevuld.");
		formObj.elements['plaats'].focus();
		return false;
	}

	if(isLeeg(formObj.elements['email'].value))
	{
		alert("Er is geen emailadres ingevuld.");
		formObj.elements['email'].focus();
		return false;
	}

	if(!geldigeEmail(formObj.elements['email'].value))
	{
		alert("Het emailadres is onjuist.");
		formObj.elements['email'].focus();
		return false;
	}
}

function checkForm()
{
	var formObj = document.forms['contact'];

	if(isLeeg(formObj.elements['naam'].value))
	{
		alert("Er is geen naam ingevuld.");
		formObj.elements['naam'].focus();
		return false;
	}

	if(isLeeg(formObj.elements['email'].value))
	{
		alert("Er is geen emailadres ingevuld.");
		formObj.elements['email'].focus();
		return false;
	}

	if(!geldigeEmail(formObj.elements['email'].value))
	{
		alert("Het emailadres is onjuist.");
		formObj.elements['email'].focus();
		return false;
	}

	if(isLeeg(formObj.elements['vraag'].value))
	{
		alert("Er is geen vraag ingevuld.");
		formObj.elements['vraag'].focus();
		return false;
	}
}

// Controleer of invoer voldoet als een geldig emailadres
function geldigeEmail(strInvoer)
{
	// Stel filter in
	//var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

	// Test invoer
	if (filter.test(strInvoer))
		return true; // Invoer correct, return true
	else
		return false; // Invoer niet correct, return false
}

// Controle of de invoer leeg of alleen spaties bevat
function isLeeg(strInvoer)
{
	if (strInvoer.match(/^\s+$/) || strInvoer == "")
	{
		return true;
	}
	else
	{
		return false;
	}
}
// DATE VERIFIER
var dtCh= "/";
var minYear=1920;
var maxYear=2099;

function isInteger(s) {
	var i;
	for (i = 0; i < s.length; i++){   
		// Check that current character is number.
		var c = s.charAt(i);
		if (((c < "0") || (c > "9"))) return false;
	}
	// All characters are numbers.
	return true;
}

function stripCharsInBag(s, bag) {
	var i;
	var returnString = "";
	// Search through string's characters one by one.
	// If character is not in bag, append to returnString.
	for (i = 0; i < s.length; i++){   
		var c = s.charAt(i);
		if (bag.indexOf(c) == -1) returnString += c;
	}
	return returnString;
}

function daysInFebruary (year) {
	// February has 29 days in any year evenly divisible by four,
	// EXCEPT for centurial years which are not also divisible by 400.
	return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}

function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr) {
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		//alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		//alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		//alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		//alert("Please enter a valid date")
		return false
	}
return true
}

function ValidateDate(tmpDate)
{
	var dt=tmpDate
	if (isDate(dt)==false){
		return false
	}
	return true
}
// DATE VERIFIER //