function naarMandje(myForm) {
	var w = 450;
	var h = 600;
	var winl = (screen.width-w)/2;
	var wint = (screen.height-h)/2;
	if (winl < 0) winl = 0;
	if (wint < 0) wint = 0;
	 _info  = "scrollbars=yes,menubars=no,toolbars=no,resizable=no,status=no,location=no";
	 _info += ",height="+h;
	 _info += ",width="+w;
	 _info += ",left="+winl;
	 _info += ",top="+wint;
	var newWin = window.open('about:blank','Mandje',_info);
	newWin.focus();
	myForm.target = 'Mandje';
	return false;
}
function toonMandje(url) {
	var w = 450;
	var h = 600;
	var winl = (screen.width-w)/2;
	var wint = (screen.height-h)/2;
	if (winl < 0) winl = 0;
	if (wint < 0) wint = 0;
	 _info  = "scrollbars=yes,menubars=no,toolbars=no,resizable=no,status=no,location=no";
	 _info += ",height="+h;
	 _info += ",width="+w;
	 _info += ",left="+winl;
	 _info += ",top="+wint;
	var newWin = window.open(url,'Mandje',_info);
	newWin.focus();
	return false;
}