// Generate a where clause from the checkboxes. If no boxes
  // are checked, return an empty string.
  function generateWhere() {
    var filter = [];
    var stores = document.getElementsByName('store');
    for (var i = 0, store; store = stores[i]; i++) {
      if (store.checked) {
        var storeName = store.value.replace(/'/g, '\'');
        filter.push("'" + storeName + "'");
      }
    }
    var where = '';
    if (filter.length) {
      where = "'Store Name' IN (" + filter.join(',') + ')';
    }
    return where;
  }