var pop_win;
function go_url(url, width, height){
	if (!pop_win){
		pop_win = window.open(url,"Anzeige","width="+width+",height="+height+",resizable=no,status=yes,scrollbars=yes,screenX=100,screenY=100");
		pop_win.focus();
	}else if (pop_win.closed == false){
		pop_win.location.href = url;
		pop_win.resizeTo(width,height);
		pop_win.focus();
	}else if (pop_win.closed == true){
		pop_win = window.open(url,"Anzeige","width="+width+",height="+height+",resizable=no,status=yes,scrollbars=yes,screenX=100,screenY=100");
		pop_win.focus();
	}else{
		pop_win = window.open(url,"Anzeige","width="+width+",height="+height+",resizable=no,status=yes,scrollbars=yes,screenX=100,screenY=100");
		pop_win.focus();
	}
}