function mapEnterKeyCommandLink(elem) {
	if (document.layers) {
  		document.captureEvents(Event.KEYDOWN);
  	}
  	document.onkeydown = 
  		function (evt) { 
      		var keyCode = evt ? (evt.which ? evt.which : evt.keyCode) : event.keyCode;
      		if (keyCode == 13) {
        		elem.onclick();
      		}
    	}
}

function mapEnterKeyCarsHotelsAndAttractions() {
	if (document.layers) {
  		document.captureEvents(Event.KEYDOWN);
  	}
  	document.onkeydown =
    	function (evt) { 
      		var keyCode = evt ? (evt.which ? evt.which : evt.keyCode) : event.keyCode;
      		if (keyCode == 13) {
        		submitForm();
      		}	
		}
}

function mapEnterKeyToHistoryBack() {
	if (document.layers) {
  		document.captureEvents(Event.KEYDOWN);
  	}
  	document.onkeydown =
    	function (evt) { 
      		var keyCode = evt ? (evt.which ? evt.which : evt.keyCode) : event.keyCode;
      		if (keyCode == 13) {
        		history.back();
      		}	
		}
}

function mapEnterKeyToURL(formName, url) {
	if (document.layers) {
  		document.captureEvents(Event.KEYDOWN);
  	}
  	document.onkeydown =
    	function (evt) { 
      		var keyCode = evt ? (evt.which ? evt.which : evt.keyCode) : event.keyCode;
      		if (keyCode == 13) {
      			form = document.forms[formName];
      			form.action = url;
      			form.submit();
      		}	
		}
}