Passing MS SQL2005 Query Result Into Javascript Function

I'm selecting the last latitude & longitude input from my database to put into the Google maps javascript function.

This is how I retrieve the longitude:

 <asp:SqlDataSource ID="lon" runat="server" ConnectionString="<%$ ConnectionStrings:LocateThis %>"

SelectCommand= "SELECT @lon= SELECT [lon] lon FROM [location] WHERE time = (SELECT MAX(time) FROM [location] where year < 2008)">

</asp:SqlDataSource>

I wish to input the latitude & longitude into the JAVASCRIPT function (contained in the HTML head before the ASP) something like this:

var map = new GMap2(document.getElementById("map"));

var lat = <%=lat%>;

var lon = <%=lon%>;

var center = new GLatLng(lat,lon);

map.setCenter(center, 13);
 

 However, lat & long do not contain the retrieved result but rather a useless System.something string.

How do I assign the retrieved results to these variables and port them over to Javascript as required?

Many thanks!