SharePoint Search Scope Drop Down List - Remove "This Site:"

In my Publishing portal, I have created 3 Search Scopes and configured the Search Settings to display the search results in Search Center (/Search/results.aspx).

It worked fine for all three scopes with no issues, but the problem is with the uninvited scope “This Site ”. This is a contextual scope (Default Scope) which always included to the scope dropdown by default out of our notice. There is no UI Setting/Configs to change this behavior. This Contextual scope always displays the search results to the ooSearchresults.aspx page which I don’t want.

This unwanted scope (“This Site ”) can be removed by injecting the following JavaScript to the master page.

<script type="text/javascript">

function SearchScDDLInj()
{
var srhScDDL = document.getElementById("ctl00$PlaceHolderSearchArea$ctl01$SBScopesDDL");
srhSpDDL.remove(0);
}
SearchScDDLInj();

</script>

Thanks!