/**
 * Update header with cart items
 */
function updateHeaderCartSummary() {
 var element;
 var items;
 var output;
 
 element = document.getElementById('view_cart_text_right');
 
 if(element == null) {
  return;
 }
 
 items = getShoppingCartItems();
 total = getShoppingCartTotal();
 
 //No items or null
 if(isShoppingCartEmpty()) {
  output = '<a href="/ShoppingCart.asp">0 items: $0.00 | Checkout</a>';
 }
 else if (items == null || total == null) {
  return;
 }
 else if(items == 0) {
  output = '<a href="/ShoppingCart.asp">0 items: $0.00 | Checkout</a>';
 }
 else {
  //Create string
  output = items + ' item';
  if (items > 1) {
   output = output + 's';
  }
  output = '<a href="/ShoppingCart.asp">' + output + ': ' + total + ' | Checkout</a>';
 }
 
 //Put data into field
 element.innerHTML = output;
}