function iconize(str)
{
  var smileys = {
    ":angry:": "angry.png",
    ":blink:": "blink.png",
    // etc
  };

  for(var smiley in smileys)
  {
    if(!smileys.hasOwnProperty(smiley)) // skip prototypes
      continue;

    var img = smileys[smiley];
    var regex = new RegExp(smiley, "gi");
    str = str.replace(regex, "<img src='/img/smiley/" + img + "' style='vertical-align:middle'>");
  }
}