function check_city(i)
{
   document.getElementById("DropDownList2").value=i;
   document.getElementById("city_list").style.display="none";
     
}<a href="#" onclick="return check_city('24优惠)">www.24uhui.com</a> 
  
dropdownlist2后台有个函数
protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
    {

怎么写可以在点击www.24uhui.com的时候 修改dropdownlist2的值并且调用 DropDownList2_SelectedIndexChanged?