var h_scrollIntervalId = null;
function _shMove(s) {
  var div = document.getElementById("hscroll");
  div.scrollTop+=s;
  return div.scrollHeight != div.scrollTop + div.clientHeight;
}
function shMove(left) {
  if (_shMove(left ? -2 : 2)) {
    if (!h_scrollIntervalId) {
        h_scrollIntervalId = setInterval("shMove("+left+")",5);
    }
  } else {
    shStop();
  }
}
function sLeft() {
  shMove(true);
}
function sRight() {
  shMove(false)
}
function shStop(){
  clearInterval(h_scrollIntervalId);
  h_scrollIntervalId = null;
}
function shWheel(e) {
 if (!h_scrollIntervalId) {
   _shMove(-e.wheelDelta);
 }
}
function shInit() {
  var imLeft = document.getElementById("sleft");
  var imRight = document.getElementById("sright");
  var div = document.getElementById("hscroll");
  if (!div) return;

    if (window.showModalDialog) {
	
  if (imLeft) {
    imLeft.attachEvent("onmousedown", sLeft);
    imLeft.attachEvent("onmouseup", shStop);
    imLeft.attachEvent("onmouseout", shStop);
  }
  if (imRight) {
    imRight.attachEvent("onmousedown", sRight);
    imRight.attachEvent("onmouseup", shStop);
    imRight.attachEvent("onmouseout", shStop);
  }
  div.attachEvent("onmousewheel", shWheel);

    } else {

  if (imLeft) {
    imLeft.onmousedown = sLeft;
    imLeft.onmouseup = shStop;
    imLeft.onmouseout = shStop;
  }
  if (imRight) {
    imRight.onmousedown = sRight;
    imRight.onmouseup = shStop;
    imRight.onmouseout = shStop;
  }
  div.onmousewheel = shWheel;

    }

}
shInit();