function OpenWindowGalerie(welkepag, windownummer) 
{
        var linkerpositie = 135;
        var toppositie = 100;
		var myWindowtje = window.open(welkepag,"Window"+windownummer,"toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=yes,copyhistory=no,scrollbars=yes,width=890,height=650,left="+linkerpositie+",top="+toppositie);
		
		myWindowtje.focus();
		myWindowtje.focus();
		myWindowtje.focus();
}