javascript - Returns true if it is a vowel, false otherwise -

below code finding out if character vowel or not. when run it, doesn't print out true or false.

can please me see doing wrong?

var vowel = function(str) {    var matches = str.match(/[aeiou]/gi);    var count = matches ? matches.length : 0;      document.getelementbyid('p').innerhtml = "'" + str + "contains" + count + "vowel(s)";      return false;  }    vowel(str);

<form>    <input type="text" name='t1'>    <input type='submit' value="submit" onclick='return vowel(this.form.t1.v'>    <div id="p"></div>  </form>

instead of document.getelementbyid try document.getelementbyid