function changepic(img_name,img_src)
{
    document[img_name].src=img_src;
}

function nextGallery( javascriptGalleries, site_root_webpath )
{
    var galleryImages = javascriptGalleries.split('|');
    var changed = 0;
    var cur = 0;
    
    for ( var i = 0; i < galleryImages.length; i++ )
    {
        curObj = site_root_webpath + "/images/products/" + galleryImages[i];

        if ( document['product_image'].src == curObj )
        {
            cur = i;
            cur++;
            if ( cur >= galleryImages.length )
            {
                cur = 0;
            }
            changed = 1;
            break;
        }
    }
    if ( changed == 0 )
    {
        document['product_image'].src = site_root_webpath + "/images/products/" + galleryImages[0];
    }
    else
    {
        document['product_image'].src = site_root_webpath + "/images/products/" +  galleryImages[cur];
    }
}

function backGallery( javascriptGalleries, site_root_webpath )
{
    var galleryImages = javascriptGalleries.split('|');
    var changed = 0;
    var cur = 0;
    
    for ( var i = galleryImages.length; i > 0; i-- )
    {
        curObj = site_root_webpath + "/images/products/" + galleryImages[i];
        if ( document['product_image'].src == curObj )
        {
            cur = i;
            cur--;
            if ( cur < 0 )
            {
                cur = galleryImages.length-1;
            }
            changed = 1;
            break;
        }
    }
    if ( changed == 0 )
    {
        document['product_image'].src = site_root_webpath + "/images/products/" + galleryImages[0];
    }
    else
    {
        document['product_image'].src = site_root_webpath + "/images/products/" +  galleryImages[cur];
    }
}