function popup(url, nome, largo, alto, barra, ridimensiona) {

IE = navigator.appName=="Microsoft Internet Explorer";
NS = navigator.appName=="Netscape";
bVer = parseInt(navigator.appVersion);


var newWin=null;
        var _params = "width="+largo+",height="+alto+",resizable="+ridimensiona+",status=no";

 		_left = ( ((screen.width - 700) / 2) - 20 );
		_top = (20 ) ;
	
        if (IE) _params += ",top=" + _top + ",left=" + _left;
        else if (NS) _params += ",screenX=" + _left + ",screenY=" + _top;
//        else if (NS) _params += ",screenX=" + _top + ",screenY=" + _left;

        newWin = window.open(url, nome, [_params,"scrollbars="+barra]);
        if ( newWin!=null && !(IE && bVer<5) )
                newWin.focus(); // MSIE4 DOESN'T FOCUS WINDOWS
}