In the template or web page, place the following JavaScript in the <head> of the page.
<script language="JavaScript">
function ImageLoadFailed() {
window.event.srcElement.style.display = "None";
}
</script>
Then, in the Web App layout where you the image is displayed, place the following:
<img src="{tag_imagename_value}?Action=thumbnail&Width=80&Height=80" OnError="ImageLoadFailed()" class="right" alt="{tag_name_nolink}" />
Comments