var holder = null;

function getContent(contentType,holderID,URL)
{    
    var productID = $get('ctl00_maincontent_hdnProductID').value;
    holder = $get(holderID);
    ServiceCalls.getContent(productID,contentType,URL,onComplete);
}

function getImage(imageID,holderID)
{
    holder = $get(holderID);
    ServiceCalls.getImage(imageID,onComplete);
}

function onComplete(result)
{        
    holder.innerHTML = result;   
}