<form id="get" name="left_form" action="">
<select id="loan" name="menu1">
<option selected="selected">Choose Type...</option>
<option value="quik_contact_form.html">Lot/Land Loan </option>
<option value="construction_loan.html">Construction to Perm Loan</option>
<option value="loan_type.html">Speculative Loan</option>
</select>
<img src="images/continue.gif" name="go" style="margin-left:111px;" onclick="top.location.href=left_form.menu1.options[left_form.menu1.selectedIndex].value" />
</form>
ну примерно вот так
в dreamveawer есть стандартная такая менюшка