[The clipboard is temporarily disabled. To restore normal function, simply close the web browser currently viewing a full size image at wallpaperama.com]

you can generate this error with the following snippet:

CODE:
<script language="JavaScript" type="text/JavaScript">
  window.setInterval("window.clipboardData.setData('Text','[The clipboard is temporarily disabled. To restore normal function, simply close the web browser currently viewing a full size image at {site_name}]')",20);
</script>


According to http://msdn.microsoft.com/workshop/author/dhtml/reference/objects/clipboarddata.asp the following code is supposed to clear the clipboard of any image data. This allows the user to retain the ability to copy and paste text, URL, file and HTML data.
CODE:
window.setInterval('window.clipboardData.clearData("Image")',20);