Javascript String beginsWith(t, i)

String.prototype.beginsWith = function(t, i) {
  if (i == false) {
    return (t == this.substring(0, t.length));
  } else {//from   w  w  w. j  a v a  2  s. co  m
    return (t.toLowerCase() == this.substring(0, t.length).toLowerCase());
  }
};