// JavaScript Document
function checkmail(hol) {
if(hol.nev.value ==""){
alert('Please enter your name.');
hol.nev.focus();
return false;
}
	var re_mail=/^([a-zA-Z0-9_\.\-])+@([a-zA-Z0-9_\-\.])+(\.[a-zA-Z]{2,4})$/;
	var mailfield = document.getElementsByName("email");
	if(!re_mail.test(mailfield[0].value)) {
		alert('Invalid e-mail adress. Please write a valid one so we can keep you posted.');
		hol.email.focus();
		return false;
	}
}