function Venster(URL) {


	VerPos = screen.width;
	VerPos = (VerPos-10) - 20;

venster = window.open(URL, 'popupvenster', 'width=' + VerPos + ', height=500, left=10, top=80, resizable=no, menubar=no, scrollbars=no, status=no, toolbar=no');
}

function Venster2(URL) {

venster = window.open(URL, 'popupvenster', 'width=598, height=700, left=10, top=80, resizable=no, menubar=no, scrollbars=yes, status=no, toolbar=no');
}

function Venster3(URL) {
venster = window.open(URL, 'popupvenster', 'width=600, height=700, left=80, top=80, resizable=no, menubar=no, scrollbars=yes, status=no, toolbar=no');
}

function CheckForm2() {
		if (document.formulier2.naam.value=="") {
			alert ("Uw naam moet nog ingevuld worden")
			document.formulier2.naam.focus();			
		} else if (document.formulier2.email.value =="") {
			alert ("U heeft uw email nog niet ingevuld")
			document.formulier2.email.focus();
					
		} else if ((document.formulier2.email.value.indexOf('@',0) == -1) | (document.formulier2.email.value.indexOf('.',0) == -1))  {
			alert("Ongeldig e-mailadres");
			document.formulier2.email.focus();

		} else {
			document.formulier2.submit();
		}
	}