How can I transfer the selected table from a list of database tables inside form to another form

TABLES

Tables will be listed here...

           <td><p>
                <div class="column">

                   <button onclick="myFunction1()" style="float:right; margin-right:0px;" id="submit1"><<</button>
                   <button onclick="myFunction2()" style="float:right; margin-right:0px;" id="submit">>></button>

               </div>

           </td>

           <td>

            <div class="column"><p>
              <p><b>TABLE(S) TO SYNC</b></p>
              <select name="List of Tables" size="25" multiple name='table1' title='List of selected tables' name="List of Tables" size="20" class='inputbox'>
              <option >. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . </option></select>
            </div><p>

           </td>