$(document).ready(function() {
     $('.sitesearch_search_field input').click(function() {
         if ( $('.sitesearch_search_field input').val() == 'Site Search') {
            $('.sitesearch_search_field input').val('');
         }
    });
     $('.sitesearch_search_field input').blur(function() {
         if ( $('.sitesearch_search_field input').val() == '') {
            $('.sitesearch_search_field input').val('Site Search');
         }
    });
});