function doMoveAction(verb) {
   if (top && top.frames) {
      var frame = top.frames["main"];
      if (frame && frame.location)
         if (frame.currentArticle)
            frame.location.href = "showitem.asp?id=" + frame.currentArticle + "&move=" + verb;
         else
            frame.location.href = "showitem.asp";
   }
}

function nextArticle() {
   doMoveAction("next");
}

function prevArticle() {
   doMoveAction("prev");
}

function firstArticle() {
   doMoveAction("first");
}

function lastArticle() {
   doMoveAction("last");
}

function upArticle() {
   doMoveAction("up");
}