asp.net - add pages to masterpage gives me javascript error -

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I have a page that uses some javascript code to run, it was working fine This master page But gives me an error from javascript 

  var fu1 = document.getElementById ("FileUpload1"); Var ex1 = extension (fu1.value);

Where do I add javascript to the master page

Try 

  var fu1 = document.getElementById ("& lt;% = FileUpload1.ClientID%>"); Var ex1 = extension (fu1.value)

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