Javascript - inArray

// access by calling "someArray.inArray(value);"
if (!Array.prototype.inArray) {
   Array.prototype.inArray=function(val) {
      for (key in this) {
         if (this[key]===val) {
            return true; // If you want the key of the matched value, change "true" to "key"
         }
      }
      return false;
   }
}