Some little php and a lot of javascript, which i am really far away of being an expert with.
Lots of bugs comes from the fact that there is only one page that do pretty everything (builder_eng.php), every infos for next level are in the $_POST variables, which is doubled with a single SQL request, everytime the page is loaded. This is the same page, for viewing-only other characters members, viewing your own characters and leveling up.
I also don't have a good debugger for IE, Opera or any other browser, whereas "Firebug" is doing great job for FireFox debugging . I wanted to add the most features i could in a minimum amount of time, and debugging it for every others browsers after the main page would be "complete".
I also thought everybody was using Firefox nowadays
