document.onkeyup = fnTrapKey;
 
function fnTrapKey(e) {
   if (!e){
         e = window.event;
   }
   var key = window.event ? event.keyCode : e.which;
   
   if (key == 13) {
         var btn = document.getElementById('_btnSubmitSearch');        
         btn.click();
   }
}
        
function SendValuesToSearchForm() {
    var search_type = document.getElementById('search_type');
    var search_text = document.getElementById('search_text');
    self.location = '/libs/CUB/search_results.aspx?search_type=' + search_type.value + '&search_text=' + search_text.value;
}

function SendValuesToSearchFormByKeyPress() {   
    if (event.keyCode == 13) {
        event.returnValue = false;
        event.cancelBubble = true;
        event.cancel = true;

        SendValuesToSearchForm();
    }
}