Ajax tools not work in IE6

im using AccordionPanel in my web when i start my web on firfox its

ok and work

but when i run my site in IE6 Ajax tools not work

what is the problem

Sorry if this is a little basic, but is JS enabled on your IE6 browser? If so, are you getting any javascript errors? Possibly "Sys is undefined"?

i haven't any problem with js

To help with your issue, you'll need to post any error messages and code samples of what is being done.

i have this same problem with the message "Sys is undefined"

but... my web.config file is ok!

can you help me?!

thank's