function alterar() {
document.forms[0].action = "<%= request.getContextPath()%>/preparaAlteracaoTransacao.do";
document.forms[0].submit();
}
function excluir() {
document.forms[0].action = "<%= request.getContextPath()%>/excluiTransacaoAction.do";
document.forms[0].submit();
}
<td style="padding-left: 5px"><input type="button" name="Alterar" value="Alterar" onclick="alterar();" class="b1" tabindex="2" disabled></td>
<td style="padding-left: 5px"><html:submit property="submit" value="Cancelar" onclick="retornar();"styleClass="b1" tabindex="11" /></td>
se alguem puder me ajudar
Mt Obg :D