var windowname = "w7104530";

if (cat) {
	var url  = "http://www.hpg.ig.com.br/banners/banner_popup_body.php3?username="
                + username
                + "&cat="
                + cat;
} else {
        var url  = "http://www.hpg.ig.com.br/banners/banner_popup_body.php3?username="
                + username;
}
var windowparam = "width=500,height=60,resizable=0,location=0,status=0,directories=0,status=0,scrolls=0";

var w7104530 = null;
w7104530  = window.open(url,windowname,windowparam);
// w7104530.focus();