function submit_form(thisform, thisvalue, thismissing) {
	if(thisvalue=='') {
		alert('Eerst dient u '+thismissing+' in te vullen');
		return;
	}
	thisform.submit();
}

function check_enter_general(form) {
	if(self.event.keyCode==13) {
		form.submit();
	}
}

function valid_email(email) {
	test=new String(email);
	if(test.indexOf('@', 0)==-1) {
		return false;
	}
	if(test.indexOf('.', 0)==-1) {
		return false;
	} else {
		var ind=test.indexOf('.', 0);
	}
	while(ind!=-1) {
		var indl=ind+1;
		ind=test.indexOf('.', indl);
	}
	if((indl-2)<=test.indexOf('@', 0)) {
		return false;
	}
	return true;
}