var win = null;

function setPopup( win ) {
    this.win=win;
}

function derefWin(){ win=null; }

function closePopup(){
    if (win!=null) {
        win.close();
        derefWin();
    }  
}

function dialog( url ){
    closePopup();
    url = "http://" + location.host + "/dialog.jsp?url=" + url;
    var width = 550;
    var height = 400;
    var top=(screen.height- height)/2;
    var left=(screen.width-width)/2;
    win=window.open("","popwin","height=" + height + ",width=" + width +",top=" + top + ",left=" + left
+ ",scrollbars,resizable");
    win.location.replace(url);
}

function popup( url ){
    closePopup();
    url = "http://" + location.host + "/" + url;
    var width = 600;
    var height = 400;
    var top=(screen.height- height)/2;
    var left=(screen.width-width)/2;
    win=window.open("","popwin","height=" + height + ",width=" + width +",top=" + top + ",left=" + left
+ ",scrollbars");
    win.location=url;
}