function setContentHeight()
{
	if(document.getElementById('leftside'))
	{
		var leftside = document.getElementById('leftside');
		var rightside = document.getElementById('rightside');
		
		// footer altijd onderaan
		var leftsideHeight = leftside.clientHeight;
		var rightsideHeight = rightside.clientHeight;
		//alert(leftsideHeight);
		//alert(rightsideHeight);
		if (rightsideHeight < leftsideHeight) {
			//alert("naar onderen");
			rightside.style.height = leftsideHeight + 'px';
		}
		
	}
}
function checkForm()
{
	var fouten = 0;
	if(document.getElementById("naam").value == "") fouten++;
	if(document.getElementById("email").value == "") fouten++;
	if(!emailCheck(document.getElementById("email").value)) fouten++;
	if (fouten > 0) {
		alert("Je hebt niet alle velden ingevuld");
	}
	else {
		document.inputform.submit();
	}
}

function emailCheck(emailStr)
{
	var emailPat=/^(.+)@(.+)$/
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
	var validChars="\[^\\s" + specialChars + "\]"
	var quotedUser="(\"[^\"]*\")"
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
	var atom=validChars + '+'
	var word="(" + atom + "|" + quotedUser + ")"
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
	
	var matchArray=emailStr.match(emailPat)
	if (matchArray==null) {
		alert("Ongeldig email adres")
		return false
	}
	var user=matchArray[1]
	var domain=matchArray[2]

	// See if "user" is valid 
	if (user.match(userPat)==null) {
		// user is not valid
		alert("Ongeldig email adres")
		return false
	}

	/* if the e-mail address is at an IP address (as opposed to a symbolic
	   host name) make sure the IP address is valid. */
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) {
		// this is an IP address
		  for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("Ongeldig email adres")
			return false
			}
		}
		return true
	}

	// Domain is symbolic name
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
		alert("Ongeldig email adres")
		return false
	}

	var atomPat=new RegExp(atom,"g")
	var domArr=domain.match(atomPat)
	var len=domArr.length
	if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>4) 
	{
		// the address must end in a two letter or three letter word.
		alert("Ongeldige domein extensie")
		return false
	}

	// Make sure there's a host name preceding the domain.
	if (len<2)
	{
		var errStr="Hostnaam ontbreekt"
		alert(errStr)
		return false
	}

	// If we've gotten this far, everything's valid!
	return true;
}