function pop(url,name,w,h){
	var win=null;
	if(win==null){
		window.open(url,name,"width="+w+",height="+h+",scrolling=no,toolbar=yes,location=no,menubar=yes,resizable=yes,scrollbars=yes,marginwidth=0,marginheight=0");
	}
	else{
		win.location=url;
		win.focus();
	}
}