function popup(url, width, height, name)
{
    var data = url;
    var params = {};
    params.scrollbars = "yes";
    params.status = "no";
    params.width = width ? width : 600; 
    params.height = height ? height : 600;
    
    var param_a = [];
    for (var name in params)
    {
        param_a.push(name + "=" + params[name]);   
    }
    
    var param_str = param_a.join(',');
    var name = name ? name : "popup";
    win = window.open(url, name, param_str);
    win.focus();
    return false;
}