function OpenWindow(url, height, width) {

    if (height == undefined)
        height = 770;

    if (width == undefined)
        width = 600;

    var _window = window.open(Url, 'aux', 'scrollbars="yes", menubar="yes"' + 
                                          ', height="' + height + 
                                          '", width="' + width + 
                                          '", resizable="yes", toolbar="yes", location="no", status="no"');  
    return false;
    
}