下拉链接
<select onchange="if(this.options[this.selectedIndex].value!='' && this.options[this.selectedIndex].value!='友情链接'){window.open(this.options[this.selectedIndex].value);}">
<option selected>友情链接</option>
<c:forEach items="${list_links}" var="FriendlyLink" >
<option value='<c:out value='${FriendlyLink.url}' />'><c:out value='${FriendlyLink.name}' /></option>
</c:forEach>
</select>