Make a Palindrome

function makePalindrome(text){
  function check(s){
    return s.split('').reverse().join('') == s;
  }
  if(check(text)) return text;
  var minhead, minheadi;
  //check head
  for(var i = 1; i <= text.length; i++){
    var s = text + text.substr(0,i).split('').reverse().join('');
    if(check(s)){
      minhead = s;
      minheadi = i;
      break;
    }
  }
  //check tail
  for(var i = 1; i < minheadi; i++){
    var s = text.substr(-i).split('').reverse().join('') + text;
    if(check(s)) return s;
  }
  return minhead;
}