function ViewAdditionalPhotos(Width, Height, CatId, HomeId) 
{
    var w = Width, h = Height;
    
    if (document.all || document.layers) 
    {
       w = screen.availWidth;
       h = screen.availHeight;
    }

    var popW = Width, popH = Height;
    var leftPos = (w-popW)/2, topPos = (h-popH)/2;

    window.open('/ViewAdditionalPhotos.aspx?CatId=' + CatId + '&HomeId=' + HomeId,'Add_Item','width=' + popW + ',height=' + popH + ',top=' + topPos + ',left=' + leftPos + ', toolbar=no, menubar=no, scrollbars=no, resizable=yes, location= no, directories=no, status=no');
}