always ie9

have you ever meet this,your flash works fine in every browser but ie9. i did a online flash photo editor.when you upload a image to backend.it’s all fine.but in ie9.i got a null from backend.i just think of compatible. as-js problem? any idea?

Backend and front end should have no problem since flash is a cross-browser plugin itself. Though if you use javascript and html to talk with server, consider using library like jQuery to ensure maximum compatibility.