title: jquery get all values in a listbox Listbox and Index a listbox
body: <p>Hi I would like to get all the values in a listbox. 
  Here is the reason. I have 3 list boxes say A,B,C when I click on an Item in A it populates B with values and I select values from B and add it to C which removes it from B so no duplicates can be added to C.</p>
  
  <p>I may still get data in B that I have already added to C. SO I need to get all the values in C so I can screen data from the server before I add them to B when I click between Items in A.</p>
  
  <p>Also the items in B(A) are not unique i.e. let say I click on an Item in A say A1 and B gets populated with data lets call this data B1(its a set) if I click on another item in A say A2 and B gets populated with data say B2 the intersection of B1 and B2 is not always empty (there could exist an item in B1 and B2).</p>
  
  <p>I know this is a bit complicated explanation but can you just tell me how to get all the values of a listbox or how to iterate through them</p>