Create a Drop-Down box with Go Button?

This is the code that I have so far:

<script type="text/javascript">
function submitForm() {
var list = document.navList.subMenu;
var page = list.options[ list.selectedIndex ].value;
if (page != "home")
window.location = page;
return false;
}
</script>

<form name="navList" onsubmit="return submitForm();">
<select name="subMenu">
<option value="home"> </option>
<option value="page1.html"> Front </option>
<option value="page2.html"> Middle </option>
<option value="page3.html"> Last </option>
</select>
<input type="submit" value="Go" />
</form>

What I want to do is use a shortcode from my theme to create the “Go” button. Does anyone know how I can do this?