Passing value from Servlet to JSP back to Servlet

Hi all,
I have a jsp page where a user submits a search string into a text box. The jsp forwards to a servlet which calls some java classes and checks a database. The classes generate a string which contains some html. The servlet then forwards back to the jsp which displays the the string:
<c:out escapeXml="false" value="${requestScope.ampList}" />The user then performs another action on this outputted html which is a listbox and when the user clicks on the listbox the onchange method submits the form. The JSP forwards the listbox value and I would like it to forward the "ampList" as well but I cant figure out how to do this.
Using a hidden input does not work because the string contains HTML. Does anyone have any ideas. I can just keep the search string stored a hidden input box but I would prefer not to regenerate the "ampList" as it means accessing the database again which will cause performance issues.
Thanks for any input in advance,
Tom

Ha,
Writing that message gave me an idea which worked:
<input type="hidden" name="ampList" value="<c:out escapeXml="true" value="${requestScope.ampList}" />" />

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