How To Get Client Id At External JavaScript File

Oct 2, 2010

when i use embedded javascript functions i can get client id of elements with this code

for example : document.getElementById('<%=buttonXXX.ClientID%>' )

but now i am using external javascript file for caching and faster rendering

but this code does not work any more for getting client id's of elements

it gives error

how can i get client ids of elements at external javascript file using asp.net 2.0 , netframework 3.5 , c# , iis 7.5

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