Custom field error with internet explorer RT3.6.1

I use new version of RT : 3.6.1.

i have problem when i use custom field ( EdilCustomFieldSelect ) in Browser
: Internet Explorer All version , but in Browser Netscape and fireforx work
fine .

the problem is that I can’t load a value of specific category , and is list
me all value ( problem in internet explorer )

I will appreciate your immediate reply