drop down menu - Javascript Get Values from Multiple Select Option Box -

This one is driving me crazy. It's been a bit straightforward and stupid that I'm ignoring. I have a selection box in a form. I'm just trying to get those values which are selected. In my loop, if I use an alert then I have no problem. As soon as the values are tried to add, I get an error. Sailbanch [...]. 'Selected' is not a zero or an object

       < 
   For  (x = 0; x & lt; InvForm.Selbranch.length; x ++)    

 


  







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