Pass Session Value as Parameter to ASP.Net AJAX AutoComplete Extender control

Hello Sir,

i followed below artical

http://www.aspsnippets.com/Articles/ASPNet-AJAX-AutoCompleteExtender-Pass-Additional-Parameter-to-WebMethod-using-ContextKey.aspx

but i want to pass the value which i stored in my "int ID"  instread of dropdown selected, please help me i am getting this error "Newline in constant"

function SetContextKey()
     {
    $find('<%=AutoCompleteExtender1.ClientID>%').set_contextKey($get("<%=ID.ClientID %>").value);
    }