function pop(url,w_width, w_height, w_scroll) {
	var param = "WIDTH="+ w_width +",HEIGHT=" +w_height+ ",toolbar=no,location=no,scrollbars=" + w_scroll + ",resizable=yes";
        
	extern = window.open(url,"extern",param);
      	browser = navigator.appName;
      	if (browser == "Netscape") 
		{
         	extern.focus();
     		}
}