var _mainImage;
var _imagePath = "";
var _imageWidth = -1;
var _imageHeight = -1;

function Thumbnail_OnMouseOver(o)
{
}
function Thumbnail_OnMouseOut(o)
{

}
function Thumbnail_OnClick(o, id, url)
{
    if(_mainImage == null)
    {
        _mainImage = document.getElementById(id + "_MainImage");
    }   
    if(_mainImage == null) return;
          
    var parameters = "";
    
    if(_mainImage.TargetWidth != undefined)
    {
        parameters = "?width=" + _mainImage.TargetWidth;
    }
    if(_mainImage.TargetHeight != undefined)
    {
        if(parameters.length > 0)
        {
            parameters += "&";
        }
        else
        {
            parameters += "?";
        }
        parameters += _mainImage.TargetHeight;
    }
          
    _mainImage.setAttribute("src", url + parameters);
    _mainImage.setAttribute("alt", o.alt);
}