/* Original:  Mike Hall (MHall75819@aol.com) */
/* Web Site:  http://members.aol.com/MHall75819 */

/* var dir = "http://www.your-web-site-address-here.com/where-you-put-the-ant-images/"; */
var dir = "./ants/";
var ANTS_ON = false;  /* {RS} */
var images = new Array(
  dir+"antdl.gif",
  dir+"antdn.gif",
  dir+"antdr.gif",
  dir+"antlt.gif",
  dir+"antrt.gif",
  dir+"antul.gif",
  dir+"antup.gif",
  dir+"antur.gif"
);

var isMinNS4 = (document.layers) ? 1 : 0;
var isMinIE4 = (document.all)    ? 1 : 0;

var _LBimgList;
var _LBimgCount;
var _LBbase = "LBbase";
var _LBlow  = "LBlow";
var _LBhigh = "LBhigh";
var _LBwidth;
var _LBheight;
var _LBbaseLayer;
var _LBlowLayer;
var _LBhighLayer;

function createLoadBar(width, height, bdSize, bdColor, bgColor, fgColor, fontFace, fontSize, text) {
  var txtLow, txtHigh, tblStart, tblEnd;
  var str;
  txtLow  = '<font color="' + fgColor + '" face="' + fontFace + '" size=' + fontSize + '>' + text + '</font>';
  txtHigh = '<font color="' + bgColor  + '" face="' + fontFace + '" size=' + fontSize + '>' + text + '</font>';
  tblStart = '<table border=0 cellpadding=0 cellspacing=0 height=100% width=100%><tr valign="center"><td align="center">';
  tblEnd = '</td></tr></table>';
  if (isMinNS4)
    str = '<layer name="' + _LBbase + '" bgcolor="' + bdColor + '" width=' + width + ' height=' + height + ' visibility="hide">\n'
    + '  <layer name="' + _LBlow  + '" bgcolor="' + bgColor + '" left=' + bdSize + ' top=' + bdSize + ' width=' + (width - 2 * bdSize) + ' height=' + (height - 2 * bdSize) + '>' + tblStart + txtLow + tblEnd + '</layer>\n'
    + '  <layer name="' + _LBhigh + '" bgcolor="' + fgColor + '" left=' + bdSize + ' top=' + bdSize + ' width=' + (width - 2 * bdSize) + ' height=' + (height - 2 * bdSize) + '>' + tblStart + txtHigh + tblEnd + '</layer>\n'
    + '</layer>';
  if (isMinIE4)
    str = '<div id="' + _LBbase + '" style="position:absolute; background-color:' + bdColor + '; width:' + width + 'px; height:' + height + 'px; visibility:hidden;">\n'
    + '  <div id="' + _LBlow  + '" style="position:absolute; background-color=' + bgColor + '; left:' + bdSize + 'px; top:' + bdSize + 'px; width:' + (width - 2 * bdSize) + 'px; height:' + (height - 2 * bdSize) + 'px;">' + tblStart + txtLow + tblEnd + '</div>\n'
    + '  <div id="' + _LBhigh  + '" style="position:absolute; background-color=' + fgColor + '; left:' + bdSize + 'px; top:' + bdSize + 'px; width:' + (width - 2 * bdSize) + 'px; height:' + (height - 2 * bdSize) + 'px;">' + tblStart + txtHigh + tblEnd + '</div>\n'
    + '</div>';
   document.writeln(str);
  _LBwidth = width - 2 * bdSize;
  _LBheight = height - 2 * bdSize;
  }

function startLoadBar(srcList, x, y) {
  var i, w, h;
  if (isMinNS4) {
    _LBbaseLayer = document.layers[_LBbase];
    _LBlowLayer  = _LBbaseLayer.document.layers[_LBlow];
    _LBhighLayer = _LBbaseLayer.document.layers[_LBhigh];
  }
  if (isMinIE4) {
    _LBbaseLayer = eval('document.all.' + _LBbase);
    _LBlowLayer  = eval('document.all.' + _LBlow);
    _LBhighLayer = eval('document.all.' + _LBhigh);
  }
  if (isMinNS4) {
    w = window.innerWidth;
    h = window.innerHeight;
  }
  if (isMinIE4) {
    w = document.body.clientWidth;
    h = document.body.clientHeight;
  }
  if (x == null)
    x = Math.round((w  - _LBwidth)  / 2);
    if (y == null)
    y = Math.round((h - _LBheight) / 2);
    moveLayerTo(_LBbaseLayer, x, y);
    clipLayer(_LBhighLayer, 0, 0, 0, _LBheight);
    showLayer(_LBbaseLayer);
    _LBimgCount = 0;
    _LBimgList = new Array();
    for (i = 0; i < srcList.length; i++) {
    _LBimgList[i] = new Image();
    _LBimgList[i].onabort = _LBupdate;
    _LBimgList[i].onerror = _LBupdate;
    _LBimgList[i].onload  = _LBupdate;
  }
  for (i = 0; i < srcList.length; i++)
    _LBimgList[i].src = srcList[i];
}

function endLoadBar() { /*  empty (can be changed) function called when finished */
  }

function _LBupdate() {
  var pct;
  _LBimgCount++;
  pct = _LBimgCount / _LBimgList.length;
  clipLayer(_LBhighLayer, 0, 0, Math.round(pct * _LBwidth), _LBheight);
  if (_LBimgCount == _LBimgList.length) {
    setTimeout('hideLayer(_LBbaseLayer)', 500);
    endLoadBar();
  }
}

function moveLayerTo(layer, x, y) {
  if (isMinNS4) layer.moveTo(x, y);
  if (isMinIE4) {
    layer.style.left = x;
    layer.style.top  = y;
  }
}

function hideLayer(layer) {
  if (isMinNS4) layer.visibility = "hide";
  if (isMinIE4) layer.style.visibility = "hidden";
}

function getWindowWidth() {
  if (isMinNS4) return(window.innerWidth);
  if (isMinIE4) return(document.body.offsetWidth);
  return(-1);
}

function getWindowHeight() {
  if (isMinNS4) return(window.innerHeight);
  if (isMinIE4) return(document.body.offsetHeight);
  return(-1);
}

function getPageScrollX() {
  if (isMinNS4) return(window.pageXOffset);
  if (isMinIE4) return(document.body.scrollLeft);
  return(-1);
}

function getPageScrollY() {
  if (isMinNS4) return(window.pageYOffset);
  if (isMinIE4) return(document.body.scrollTop);
  return(-1);
}

function getHeight(layer) {
  if (isMinNS4) {
    if (layer.document.height)
      return(layer.document.height);
    else
      return(layer.clip.bottom - layer.clip.top);
    }
  if (isMinIE4) {
    if (false && layer.style.pixelHeight)
      return(layer.style.pixelHeight);
    else
      return(layer.clientHeight);
    }
  return(-1);
}

function getWidth(layer) {
  if (isMinNS4) {
    if (layer.document.width) return(layer.document.width);
    else return(layer.clip.right - layer.clip.left);
  }
  if (isMinIE4) {
    if (layer.style.pixelWidth) return(layer.style.pixelWidth);
    else return(layer.clientWidth);
  }
  return(-1);
}

function getLeft(layer) {
  if (isMinNS4) return(layer.left);
  if (isMinIE4) return(layer.style.pixelLeft);
  return(-1);
}

function getTop(layer) {
  if (isMinNS4) return(layer.top);
  if (isMinIE4) return(layer.style.pixelTop);
  return(-1);
}

function getRight(layer) {
  if (isMinNS4) return(layer.left + getWidth(layer));
  if (isMinIE4) return(layer.style.pixelLeft + getWidth(layer));
  return(-1);
}

function getBottom(layer) {
  if (isMinNS4) return(layer.top + getHeight(layer));
  else if (isMinIE4) return(layer.style.pixelTop + getHeight(layer));
  return(-1);
}

function moveLayerBy(layer, dx, dy) {
  if (isMinNS4)  layer.moveBy(dx, dy);
  if (isMinIE4) {
    layer.style.pixelLeft += dx;
    layer.style.pixelTop+= dy;
  }
}

function showLayer(layer) {
  if (ANTS_ON) {    /* {RS} */
    if (isMinNS4) layer.visibility = "show";
    if (isMinIE4) layer.style.visibility = "visible";
  }
  else {
    if (isMinNS4) layer.visibility = "hide";
    if (isMinIE4) layer.style.visibility = "hidden";
  }
}

function clipLayer(layer, clipleft, cliptop, clipright, clipbottom) {
  if (isMinNS4) {
    layer.clip.left = clipleft;
    layer.clip.top= cliptop;
    layer.clip.right= clipright;
    layer.clip.bottom = clipbottom;
  }
  if (isMinIE4)
    layer.style.clip = 'rect(' + cliptop + ' ' +clipright + ' ' + clipbottom + ' ' + clipleft +')';
}

var mouseX = 0;
var mouseY = 0;
if (isMinNS4) document.captureEvents(Event.MOUSEMOVE);
document.onmousemove = getMousePosition;

function ants_init() {
  startLoadBar(images);
}

function getMousePosition(e) {
  if (isMinNS4) {
    mouseX = e.pageX;
    mouseY = e.pageY;
  }
  if (isMinIE4) {
    mouseX = event.clientX + document.body.scrollLeft;
    mouseY = event.clientY + document.body.scrollTop;
  }
  return true;
}

var ants = new Array(8);
function endLoadBar() {
  var i;
  for (i = 0; i < ants.length; i++) {
    if (isMinNS4) {
      ants[i] = document.layers["ant" + (i + 1)];
      ants[i].image = ants[i].document.images["antimg" + (i + 1)];
    }
    if (isMinIE4) {
      ants[i] = eval('document.all.ant' + (i + 1));
      ants[i].image = document.images["antimg" + (i + 1)];
    }
    initAnt(i);
    showLayer(ants[i]);
  }
  /* updateAnts(); */
}

function initAnt(n) {
  var s, x, y;
  x = Math.floor(Math.random() * getWindowWidth());
  y = Math.floor(Math.random() * getWindowHeight());
  s = Math.floor(Math.random() * 4);
  if (s == 0) x = -getWidth(ants[n]);
  if (s == 1) x = getWindowWidth();
  if (s == 2) y = -getHeight(ants[n]);
  if (s == 3) y = getWindowHeight();
  x += getPageScrollX();
  y += getPageScrollY();
  moveLayerTo(ants[n], x, y);
}

function updateAnts() {
  var i, dx, dy, theta, d;
  d = 3;
  for (i = 0; i < ants.length; i++) {
    dx = mouseX - getLeft(ants[i]);
    dy = mouseY - getTop(ants[i]);
    theta = Math.round(Math.atan2(-dy, dx) * 180 / Math.PI);
    if (theta < 0) theta += 360;
    if (Math.abs(dx) < d && Math.abs(dy) < d) initAnt(i);
    else if (theta > 22.5 && theta <= 67.5) {
      moveLayerBy(ants[i], d, -d);
      ants[i].image.src = dir+"antur.gif";
    }
    else if (theta > 67.5 && theta <= 112.5) {
      moveLayerBy(ants[i], 0, -d);
      ants[i].image.src = dir+"antup.gif";
    }
    else if (theta > 112.5 && theta <= 157.5) {
      moveLayerBy(ants[i], -d, -d);
      ants[i].image.src = dir+"antul.gif";
    }
    else if (theta > 157.5 && theta <= 202.5) {
      moveLayerBy(ants[i], -d, 0);
      ants[i].image.src = dir+"antlt.gif";
    }
    else if (theta > 202.5 && theta <= 247.5) {
      moveLayerBy(ants[i], -d, d);
      ants[i].image.src = dir+"antdl.gif";
    }
    else if (theta > 247.5 && theta <= 292.5) {
      moveLayerBy(ants[i], 0, d);
      ants[i].image.src = dir+"antdn.gif";
    }
    else if (theta > 292.5 && theta <= 337.5) {
      moveLayerBy(ants[i], d, d);
      ants[i].image.src = dir+"antdr.gif";
    }
    else {
      moveLayerBy(ants[i], d, 0);
      ants[i].image.src = dir+"antrt.gif";
    }
  }
  clearTimeout(ANTS);  /* {RS} */
  ANTS = setTimeout('updateAnts()', 50); /* {RS} */
  return;
}