String.prototype.startWith = function(s) { 
    if (s == null || s == "" || this.length == 0 || s.length > this.length) 
        return false; 
    if (this.substr(0, s.length) == s) 
         return true;
    else 
        return false; 
    return true; 
}

String.prototype.endWith = function(s) {

     if (s == null || s == "" || this.length == 0|| s.length > this.length)

          return false;

     if (this.substring(this.length - s.length) == s)

          return true;

     else

          return false;

    return true;

}