<select name="TiaoClass" class="txtinput" onChange='javascript:window.open(this.options[this.selectedIndex].value);'>
<option>1</option>
<option value="http://www.corange.cn">corange.cn</option>
</select>
<option>1</option>
<option value="http://www.corange.cn">corange.cn</option>
</select>