jQuery Grid Plugin - jqGrid

I've wirten a piece of code in order to add jquery autocomplete plugin to input fields in search modal box.

the autocomplete works fine, but when i select any suggestion from it, search module does not work properly.

e.g. i write "som" in the text field,autocomplete suggest "somethings" and i select that. then i press the "Find" button to search :

In Chrome : search request is look like this >> 

filters: {"groupOp":"AND","rules":[{"field":"manufacturer","op":"eq","data":"som"}]}

just same chars which i've entered ,is sent via request!!!!!

In FireFox : the first request is correct and filter done correctly,but when i wanna change the value (e.g type "something else"), the request does not change, and it resend the previuos word(in this example "somethings") !?!!!?

and in IE 7 everything is fine!!!!!!

this is my script that add jquery autocmlpt :

I tried this line in Chrome Devel tool console :

and then pressed Find button. the result was the same BUG!!!!!