Multiple sumbit buttons in form

I have a form with multiple drop downs and multiple submit buttons. Once a second dropdown/submit button is put onto the page I get a javascript error. I know each dropdown/submit button should be placed within its own form but I am working with .aspx pages and I can't have a form within a form. What I want is to have each submit button control its own drop down. Any help is much appreciated.


<form id="menufrm" runat="server" method="post">



<select name="menu" value="GO" style="width: 200px;">

<option selected value="/itemdetail.aspx?ID=81">1/4ct.tw.

- $325.00</option>

<option value="/itemdetail.aspx?ID=82">1/3ct.tw. -

$415.00</option>

<option value="/itemdetail.aspx?ID=97">1/2ct.tw. -

$875.00</option>

<option value="/itemdetail.aspx?ID=98">3/4ct.tw. -

$1,300.00</option>

<option value="/itemdetail.aspx?ID=99">1ct.tw. - $2,800.00</option>

<option value="/itemdetail.aspx?ID=100">1 1/2ct.tw.

- $5,400.00</option>

</select>



<input type="button" value="" name="link_go" onClick="location=document.menufrm.menu.options[document.menufrm.menu.selectedIndex].value;" />



<select name="menu" value="GO" style="width: 200px;">

<option selected value="/itemdetail.aspx?ID=81">1/4ct.tw.

- $325.00</option>

<option value="/itemdetail.aspx?ID=82">1/3ct.tw. -

$415.00</option>

<option value="/itemdetail.aspx?ID=97">1/2ct.tw. -

$875.00</option>

<option value="/itemdetail.aspx?ID=98">3/4ct.tw. -

$1,300.00</option>

<option value="/itemdetail.aspx?ID=99">1ct.tw. - $2,800.00</option>

<option value="/itemdetail.aspx?ID=100">1 1/2ct.tw.

- $5,400.00</option>

</select>



<input type="button" value="" name="link_go" onClick="location=document.menufrm.menu.options[document.menufrm.menu.selectedIndex].value;" />



</form>