function winH(ID) {

var xsize = screen.width
var ysize = screen.height
var breite=680
var hoehe=Math.round(ysize/100*90);
var xpos=(xsize-breite)/2;

	var url="hotel.php?ID="+ID;
	var f=window.open(url,"Fenster1","width=680,height="+hoehe+",left="+xpos+",top=ypos,resizable=no");
}