javascript event.target not working in mozilla

<script type ='javascript'> function fun(userID) { var btn = event.target; // error 'event' undefine in mozilla alert(btn.id); } </script> <asp:linkButton id ="target" style =" cursor:pointer" onclick ="fun('1')" >click here </asp:LinkButton> I am new in JavaScript, I have written above code and this code is working fine in Google chrome but not working in Mozilla Firefox. … Read more