function subWindow() {
    if (arguments.length < 1) {
        alert("function subWindow called with " + arguments.length +
              " arguments, but it expects at least 1 arguments.");
        return null;
    }
    var widthval = arguments[1] != null ? arguments[1] : 640;
        var heightval = arguments[2] != null ? arguments[2] : 480;
    var filename = arguments[3] != null ? arguments[3] : "";
    var dimensions = "directory=0,height="+heightval+",width="+widthval+
                     ",left=30,top=80,resizable=1,statusbar=1,hotkeys=0,menubar=0,scrollbars=1,status=0,toolbar=0";
    var newWindow = window.open('',arguments[0],dimensions);

        newWindow.document.write("<title>NZERF | Gallery</title>")
        newWindow.document.write('<img src="images/gallery/'+filename+'"><br><br><div align="center"><input type="button" value="Close Window" onclick="window.close()"></div>')

 	
    
    return;
}