function bild(titel,pfad,h,w)
{
	var fenster;
	var x,y,h1;
	h1=h+20;
	fenster=window.open("bild_gross.php?titel="+titel+"&pfad="+pfad+"&h="+h+"&w="+w,"","height="+h1+",width="+w+",menubar=no,locationbar=no,status=no");
	fenster.focus();
	if(navigator.appName=="Microsoft Internet Explorer")
		 {
		 fenster.resizeTo(w,h1);
		 x=(screen.width-w)/2;
		 y=(screen.height-h1)/2;
		 }
		 else
		 {
		 x=(screen.width-fenster.outerWidth)/2;
		 y=(screen.height-fenster.outerHeight)/2;
		 }
	fenster.moveTo(x,y);
}