function Checkvalue (waarde) 
{
	if (waarde == "")	
	{
	alert("Dit is een verplicht veld");
	return true;
	}
	return false;
}
			
							
function Check (emailStr) {

var checkTLD=1;
var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
var emailPat=/^(.+)@(.+)$/;
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("Email adres is niet juist.");
		document.mobjForm.email.focus();
		return false;	
		}
	var user=matchArray[1];
	var domain=matchArray[2];


for (i=0; i<user.length; i++) {
if (user.charCodeAt(i)>127) {
		alert("Email adres is niet juist.");
		document.mobjForm.email.focus();
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
		alert("Email adres is niet juist.");
		document.mobjForm.email.focus();
return false;
   }
}

if (user.match(userPat)==null) {

		alert("Email adres is niet juist.");
		document.mobjForm.email.focus();
return false;
}

var IPArray=domain.match(ipDomainPat);
if (IPArray!=null) {

for (var i=1;i<=4;i++) {
if (IPArray[i]>255) {
	alert("Destination IP address is invalid!");
	document.mobjForm.email.focus();
return false;
   }
}
return true;
}

var atomPat=new RegExp("^" + atom + "$");
var domArr=domain.split(".");
var len=domArr.length;
for (i=0;i<len;i++) {
if (domArr[i].search(atomPat)==-1) {
	alert("Email adres is niet juist.");
	document.mobjForm.email.focus();
return false;
   }
}

if (checkTLD && domArr[domArr.length-1].length!=2 && 
domArr[domArr.length-1].search(knownDomsPat)==-1) {
	alert("Email adres is niet juist.");
	document.mobjForm.email.focus();
return false;
}

if (len<2) {
	alert("Email adres is niet juist.");
	document.mobjForm.email.focus();
return false;
}

document.mobjForm.action ="http://www.sap-informatiesessies.com/Page.epx?eventID=249";
document.mobjForm.submit(); 
//return true;
}