function validateForm(){              
            if ((document.forms[0].search.value=="Enter Search Term") || (document.forms[0].search.value=="") ) {
                  alert("You must enter a search term");
            } else {
                 window.location='/search?q=' + escape(document.forms[0].search.value);
            }
      }


$(document).ready(function() {  
  $("#search").keydown(
    function(event) {
        if (event.keyCode == 13) {
            if ((document.forms[0].search.value=="Enter Search Term") || (document.forms[0].search.value=="") ) {
                  alert("You must enter a search term");
                  return false;
            } else {
                 window.location='/search?q=' + escape(document.forms[0].search.value);
                 return false;               
            }
        }
    })
});