Format the users entry from a get command

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SQL

HTML

website

I have a web page that uses the get command to retrieve a user entered string. This string is then passed via a proprietary language into a sql search. I want to convert any &nbs to to % so that user entered spaces become wildcards instead of spaces. Is there a script or series of commands that can be built into the get call?

Here is the code:

<td class="EntVal">
            <form action="http:/scripts/trs.exe" method="get">
              <input onblur="EntBlur(this)" onfocus="EntFocus(this)" onkeydown="EntKeyDown(this)" class="CODE" name="LIKE" /><input class="submit" type="submit" value="GO" name="BtnGo" /><input class="Hide" type="hidden" value="@CNC" name="CN" /><input class="Hide" type="hidden" value="@TER" name="TN" /><input class="Hide" type="hidden" value="pda" name="DN" /><input class="Hide" type="hidden" value="pda_pos_itm_search" name="CGI" /><input class="Hide" type="hidden" value="Pos" name="HOSTFORM" /><input class="Hide" type="hidden" value="0:0" name="CP" />
            </form>
          </td>

example:

user input = 'roc hot' get passes 'roc%hot%'

Thank you!