Javascript check if function exists -

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I followed the creation of a new JS to flash the communication:

So my code looks like this Is: 

  function getID (swfID) {if navigator.appName.indexOf ("Microsoft")! = -1) {me = window [swfID]; } And {me = document [swfID]; }} Function js_to_as (str) {me.onChange (str); }

Now, my on change does not load, but currently, firebug displays

< P> me.onChange is not a function

error and completely stops

I want to show it very low because it is the most important in my program Not attribute. I tried typeof but it still gives the same error.

There is a suggestion on how to ensure that it exists and then only execute on

Try something like this 

  if (typeof me .onChange! == "undefined") {// Safe to use function}

Or better yet (according to 

  if (typeof me.onChange === "function") {// safe to use function} HTML>

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