function onImgErrorXSmall(source)
{
source.src = "http://www.plasmaconcepts.com/images/no-image-50px.gif";
// disable onerror to prevent endless loop
source.onerror = "";
return true;
}
function onImgErrorSmall(source)
{
source.src = "http://www.plasmaconcepts.com/images/no-image-100px.gif";
// disable onerror to prevent endless loop
source.onerror = "";
return true;
}

function onImgErrorLarge(source)
{
source.src = "http://www.plasmaconcepts.com/images/no-image-300px.gif";
// disable onerror to prevent endless loop
source.onerror = "";
return true;
}