function testforminput() {


var emailEntered = "";
 emailEntered=document.forms[0].Email.value;

if (document.forms[0].Email.value =="") {
    alert ("Vul aub het emailadres in.");
    document.forms[0].elements["Email"].focus();
    return false;
  }
else
{
	emailValue= new String(emailEntered);
    emailHasAt=emailValue.indexOf("@");
	 emailHasPeriod=emailValue.indexOf(".");
	 if ((emailHasAt == -1) || (emailHasPeriod == -1 )){
		alert ("Het teken @ of de . ontbreekt in uw emailadres. Corrigeer het aub.");
   	document.forms[0].elements["Email"].focus();
   	return false;
   }  
}			
	
	
if (document.forms[0].lastname.value =="") {
    alert ("Vul aub uw achternaam in.");
    document.forms[0].elements["lastname"].focus();
    return false;
  }	


if (document.forms[0].address1.value =="") {
    alert ("Vul alstublieft minimaal 2 adresregels in. Regel 1 is leeg.");
    document.forms[0].elements["address1"].focus();
    return false;
  }
	
if (document.forms[0].address2.value =="") {
    alert ("Vul alstublieft minimaal 2 adresregels in. Regel 2 is leeg.");
    document.forms[0].elements["address2"].focus();
    return false;
  }	
	
}