Use something like get_file_contents to get the version off your server from a text file, then use that variable and compare it to the current version number to alert if an update is needed.
Why don't you post your code and your errors instead of asking someone who wants to help you to do all the work for you?
Basically should be something like this.. $thisver = "1.0"; // Version 1.0 $currentver = get_file_contents("http://yoursite.com/ver.txt"); // Version 1.1 if ($thisver < $currentver) { // If $thisver is less than $currentver.. echo "Update Available!"; } Its quite simple really..