[Greasemonkey] calling my script from a page

[s g]

i've modified a page with a "a" element
   
     var link = document.createElement("a");
   link.href = "javascript:alert(\"hello\");";
   
  and inserted into a doc and it works.
   
  i'd like to actually call a function in my GM file.
   
  when i do:
   
  link.href = "javascript:my_function()";
   
  it doesn't work.
   
  help!
  
 

 			
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