Highlighting/selecting Items In Multiple Select Lists?

I have a cgi script (using perl for database queries) in which I have two select boxes. I am populating the left select box with rows from a database, and then provide buttons for people to move items to the right select box.

So far so good, everything works, the move right, move left, and move right all and move left all buttons work, data is always sorted in both lists. My only problem is, when I click the submit button, the follow up program only displays data that was highlighted/selected in the right select box, not all of the data in the right select box.

I don't know how to tell the script, via javascript, to highlight everything in the right select box when the submit form button is clicked. I would think i could just call a function via -onClick for the submit button. I could use some help with the function to select all data in that list.