function file_navigate(choice) 
{
    var url = choice.options[choice.selectedIndex].value;
    if (url) 
    {
        //location.href = url;
        var width = parseInt(screen.availWidth);
        var height = parseInt(screen.availHeight);
        var left = parseInt((screen.availWidth));
    	var top = parseInt((screen.availHeight));
    	var windowFeatures = "width=" + width + ",height=" + height + 
        ",status,resizable,left=" + left + ",top=" + top + 
        ",screenX=" + left + ",screenY=" + top;

        myWindow = window.open(url, "subWind", windowFeatures);
    }
}