ok, after a bit of testing my code is correct and the groundoverlays do work, but what seems to be the problem is the data in the plug in isnt updating.
I have been updating overlays and links to the server and uploading and viewing my site in chrome, the data in the site never seems to change, but when when viewed in Internet Explorer i see the current data, so how do i go about getting GE plug in to load the newest data instead of the old.