<form name="form1">
<select name="menu1" onChange="location.href=this.value">
<option value="index.php">index</option>
<option value="try.php">try</option>
</select>
</form>
<select name="menu1" onChange="location.href=this.value">
<option value="index.php">index</option>
<option value="try.php">try</option>
</select>
</form>
MM_jumpMenu这个函数你有没有?