function open_window(mypage,w,h){
	self.name = "main";
	var winbreite=(screen.width-w)/10;
	var winhoehe=(screen.height-h)/10;
	var myname;
	winprops='height='+h+',width='+w+',top='+winhoehe+',left='+winbreite+',scrollbars=1,resizable=0'
	win=window.open(mypage, myname, winprops)
}
//<!-- <a href="javascript:open_window('seite.php','name',400,450)"> 
// onload="open_window();"   setTimeout("open_window()", 10000);-->