function new_frame(location, location_title, width, height)
{
    prob  = "left="+((screen.width  - width)  / 2)+",";
    prob += "top="+100+",";
    prob += "screenX="+((screen.width  - width)  / 2)+",";
    prob += "screenY="+100+",";
    prob += "width="+width+",";
    prob += "height="+height+",";
    prob += "menubar=0,";
    prob += "toolbar=0,";
    prob += "statusbar=0,";
    prob += "scrollbars=1,";
    prob += "resizable=0,";
    prob += "locationbar=0,";
    prob += "directories=0";

    win = window.open(location, location_title, prob);
    win.focus();
    
    return false;
}