var unique = function(origArr) {
 var newArr = [],
  origLen = origArr.length,
  found,
  x, y;
 for ( x = 0; x < origLen; x++ ) {
  found = undefined;
  for ( y = 0; y < newArr.length; y++ ) {
   if ( origArr[x] === newArr[y] ) {
    found = true;
    break;
   }
  }
  if ( !found) newArr.push( origArr[x] );
 }
 return newArr;
}
var myarray = ['jeffrey', 'allie', 'patty', 'damon', 'zach', 'jeffrey', 'allie', 'patty', 'damon', 'zach', 'joe'];
myarray = unique(myarray);
alert(myarray.join(', '));