The following script will display the image referenced by the screen location in the src below. If that image does not exist at that location, it is not a valid path or the user does not have authority to view the image, the default image specified in the onerror event will be displayed instead.
This code can be added at the very end of the Custom HTML on your Presto custom page.
<script >
Presto.Transform(
{
row: 11,
col: 50,
object: "image",
src: "",
onerror: "Presto.Transform({row: 11, col: 50, object: 'image', src: 'images/notfound.jpg'})"
});
</script >