Probably you do not initialize the pageLoad
no where in your code.
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_endRequest(pageLoad);
This pageLoad is not a function that automatically called from UpdatePanel, you need to initialize that on javascript
part. Actually is not a know function, so I guess that you copy paste this code from somewhere with out this part.
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solved error updating inside js (tabbed panel) [closed]