jquery in Asp.net

there are 2 dropdowns for the leagues and you can only select one team so when something other than select is selected on one dropdown we disable the other drop down

  225

  226         <asp:Label ID="lblAmericanLeague" runat="server" Text="American League"></asp:Label> 

  227         <asp:DropDownList ID="AmericanLeague" runat="server"> 

  228             <asp:ListItem Text="-Select-" Value="-1" ></asp:ListItem>

  229             <asp:ListItem Text="Chicago White Sox" Value="ChicagoWhiteSox" ></asp:ListItem>

  230             <asp:ListItem Text="Baltimore Orioles" Value="BaltimoreOrioles" ></asp:ListItem>

  231             <asp:ListItem Text="Boston Red Sox" Value="BostonRedSox" ></asp:ListItem>

  232             <asp:ListItem Text="New York Yankees" Value="NewYorkYankees" ></asp:ListItem>

  243         </asp:DropDownList><br />

  244

  245         <asp:Label ID="lblNationalLeague" runat="server" Text="National League"></asp:Label> 

  246         <asp:DropDownList ID="NationalLeague" runat="server"> 

  247             <asp:ListItem Text="-Select-" Value="-1" ></asp:ListItem>

  248             <asp:ListItem Text="ChicagoCubs" Value="ChicagoCubs" ></asp:ListItem>

  249             <asp:ListItem Text="AtlantaBraves" Value="AtlantaBraves" ></asp:ListItem>

  250             <asp:ListItem Text="FloridaMarlins" Value="FloridaMarlins" ></asp:ListItem>

  264         </asp:DropDownList><br />

and the jquery looks like this ...

  302

  303 <script type="text/javascript" >

  304     $(document).ready(function() { 

  305         $('#<%=NationalLeague.ClientID %>').click(function() {

  306             var SelectedVal = $('#<%=NationalLeague.ClientID %>').val();

  307             if (SelectedVal == "-1") {

  308                 $('#<%=AmericanLeague.ClientID %>').removeAttr("disabled");

  309             }

  310             else {

  311                 $('#<%=AmericanLeague.ClientID %>').val("-1");

  312                 $('#<%=AmericanLeague.ClientID %>').attr("disabled", true);

  313             }

  314         }); 

  315         $('#<%=AmericanLeague.ClientID %>').click(function() {

  316             var SelectedVal = $('#<%=AmericanLeague.ClientID %>').val();

  317             if (SelectedVal == "-1") {

  318                 $('#<%=NationalLeague.ClientID %>').removeAttr("disabled");

  319             }

  320             else {

  321                 $('#<%=NationalLeague.ClientID %>').val("-1");

  322                 $('#<%=NationalLeague.ClientID %>').attr("disabled", true);

  323             }

  324         });

  325     });

  326

  327 </script>