javascript remove array item

function removeVal(arr, valToRemove){
  // Normalize to a string like !val!!val!!val!
  var s = '!' + arr.join('!!') + '!';
  // Remove targeted values with delimiters
  s = s.replace(new RegExp('!' + valToRemove + '!', 'g'), '');
  // Remove delimiter added to end in step 1
  s = s.replace(/^!/, '');
  // Remove delimiter added to start in step 1
  s = s.replace(/!$/, '');
  // Convert to array
  return s.split('!!');
}

function test(){
  var arr = [2,1,2,2,5,7,12,15,21,2]; // Check case with end vals
  var s = arr.toString();
  arr = removeVal(arr, 2)
  alert(s + '\n' + arr.toString());
}

source : http://webdevel.blogspot.com