title: Hide Options from Mutiple Select box using Javascript
body: <p>I need to hide certain options from Multiple selection box using Javascript.
  I can't got for jQuery, and I am not allowed to.</p>
  
  <p>I have one more dropdown box, I am calling a js function which will be called upon change of the value. The js function will control the options of another multiple select options box, where I need to hide (not remove) options based on dropdown box value.</p>
  
  <p>Any simple js function?</p>
  
  <p><a href="http://jsfiddle.net/zz3dg/" rel="nofollow">http://jsfiddle.net/zz3dg/</a></p>