function selectFirstRadio(ctrlName)
{
    var container = document.getElementById(ctrlName);
    var radios = container.getElementsByTagName("input");
    
    for(i = 0; i < radios.length; i++)
    {
        if(radios[i].type=="radio")
        {
            radios[i].checked = true;
            break;
        }
    }
}

Product_ShowImage = function(imgTagID, imageUrl) {
    document.getElementById(imgTagID).src = imageUrl;
}