function chkVerplicht(){
var compleet = true;
for (var loop=0; loop < document.forms[0].elements.length; loop++)
{
	var myString = document.forms[0].elements[loop].name
	var index = myString.indexOf("_*");

	myString = myString.replace('_*','')

	if(myString == 'E-mail')
		{
			document.forms[0].emailvan.value=document.forms[0].elements[loop].value;
		}

	if (document.forms[0].elements[loop].value == "")
	{

	if(index != -1){


	alert('Het veld "'+myString+'" is verplicht!')
	document.forms[0].elements[loop].focus()
	loop = document.forms[0].elements.length
	compleet = false;
	}
	}
}
if(compleet == true){
 	document.forms[0].submit()
 	}
}