function pop(url,sb,wd,ht) {
	day = new Date();
	id = day.getTime();
	var left = (screen.availWidth-wd)/2;
	var top = (screen.availHeight-ht)/2;
	eval("page"+id+"=window.open(url,'"+id+"','scrollbars="+sb+",width="+wd+",height="+ht+",left="+left+",top="+top+"');");
}