TvH chat seizure 3

function getRandomColor() {
    var letters = '0123456789ABCDEF'.split('');
    var color = '#';
    for (var i = 0; i < 6; i++ ) {
        color += letters[Math.floor(Math.random() * 16)];
    }
    return color;
}
function changeColors() {
        chatFrame = document.getElementById("frame_chatbox");
        var anchors;
        if(chatFrame == null)
            anchors = document.getElementsByTagName("a");
        else
            anchors = chatFrame.contentDocument.getElementsByTagName("a");
        var color = getRandomColor();
        for(i = 0; i < anchors.length; i++) {
          ref = anchors[i].getAttribute("href");
          if(ref == null)
                ref = anchors[i].getAttribute("HREF");
          if(ref != null) {
                user = (ref.search("/u") >= 0);
                if(user) {
                  span = anchors[i].getElementsByTagName("span")[0];
                  if(span != null)
                    span.style.color = color;
                }
          }
        }
}
setInterval(function() {changeColors();}, 500);