//Functie voor popup
function createWindow(pageURL, pageName, width, height){
	//pageName.window.close();
	var w = width;
	var h = height;
	var winl = (screen.width - w) / 2;
	var wint = ((screen.height - h) / 2)-20;
	winprops =  'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars=yes';
	oPopup = window.open(pageURL, pageName, winprops);
	oPopup.focus();
}