how to validate asp:dropdown list using javascript.

Question

Hey friends,   

             how to change dropdown border color when its initIal value is 00 using jquery

 

 I m using this code but its not working ,,please help

 <script type="text/javascript">

function validate() {

var v = document.getElementById("<%=ddlMDist.SelectedValue%>");

if (v == "00") {

v.style.backgroundColor = "red";

}

 </script>

 

 

 

<asp:UpdatePanel ID="UpdatePanel4" runat="server" UpdateMode="Always">

<ContentTemplate>

<asp:DropDownList ID="ddlMDist" runat="server" data-toggle="dropdown" aria-haspopup="true" AutoPostBack="True" TabIndex="6" OnSelectedIndexChanged="ddlMDist_SelectedIndexChanged" onchange="validate();">

<asp:ListItem Value="00">Dist Name</asp:ListItem>

</asp:DropDownList>

 </ContentTemplate>

</asp:UpdatePanel>