Assign value to a .net control label using javascript

i have a dropdown with two values, if i select the first value i need a value in a label. If i select second value, i need another value in same label.

I have included the code as below ,

but there is no message after i select a value from dropdown
;-(

 <link rel="stylesheet" type="text/css" href="homepage2005.css" />
 
    <script language="javascript" type="text/javascript">
        if (document.getElementById('<%=Me.ddl_view0_HubSelection.ClientId%>').value == 'Hub Role') {
            document.getElementById('<%=Me.lblHubMessage.ClientId%>').value = 'These are for Level 1, 2 and 3 IDs';
        }
        else {
            document.getElementById('<%=Me.lblHubMessage.ClientId%>').value = 'These will, have a level 4 ID or greater';
        }

Select allOpen in new window

this is what exactly ur in need of

Java script function  
<script type = "text/javascript" >
    function GetList()
    {
        
        var List = document.getElementById("<%= DDLisT.ClientID %>").value;
        var lbl = document.getElementById("<%= Test.ClientID  %>");
        if( List != lbl.value)
        {
            lbl.innerHTML = List;
        }    
    }
    </script> 

content in aspx Page  
<asp:DropDownList ID = "DDLisT" runat = "server" >
    <asp:ListItem Text = "Item1" Value = "1"></asp:ListItem>
    <asp:ListItem Text = "Item2" Value = "2"></asp:ListItem>
    <asp:ListItem Text = "Item3" Value = "3"></asp:ListItem>
    <asp:ListItem Text = "Item4" Value = "4"></asp:ListItem>
    </asp:DropDownList>
    <asp:Label ID = "Test" runat = "server" /> 

Adding attribute in Code Behind On Page Load  
 if (!Page.IsPostBack)
        {
           
            DDLisT.Attributes.Add("OnChange", "return GetList();");
        } 
 
get back to me in case of issues 

Select allOpen in new window

prince->

Does the above work on once i postback?

i need to get the message, very fast one i select the dropdown, no need to hit the server!

i am not understanding where the two values are inserted in to the lable?

this code will take responsible of inserting a value into the lable

var List = document.getElementById("<%= DDLisT.ClientID %>").value;
        var lbl = document.getElementById("<%= Test.ClientID  %>");
        if( List != lbl.value)
        {
            lbl.innerHTML = List;
        }