// popup fenster welches in der mitte des bildschirms zentriert, 
// und falls zu gross für die entsprechende auflösung angepasst wird.

function popUp (url,width,height,scroll) {
	if(height>window.screen.height) { var height = window.screen.height-60; var width2 = parseInt(width); width2 += 16; width2 = width2.toString(); var scroll = 'yes'; }
	else { var width2 = width; if(!scroll) var scroll = 'no'; } 
	var winl = (screen.width-width2)/2 - 4; var wint = (screen.height-height)/2 + 6;
	var popUp = window.open(url,popUp,"width=" + width2 + ",height=" + height + ",top=" + wint + ",left=" + winl + ",scrollbars=" + scroll + ",menubar=no,location=no,directories=no,resizable=no,status=no"); 
	popUp.focus();
}