Javascript Array inArray(value,caseSensitive)

Array.prototype.inArray = function (value,caseSensitive) {
// Returns true if the passed value is found in the
// array. Returns false if it is not.

 var i;//from   www  .  j  av a  2  s. c  o m
 for (i=0; i < this.length; i++) {
 // use === to check for Matches. ie., identical (===),
  if(caseSensitive){ //performs match even the string is case sensitive
   if (this[i].toLowerCase() == value.toLowerCase()) {
    return true;
   }
  }else{
   if (this[i] == value) {
    return true;
   }
  }
 }
 return false;
};