simpleScroll.prototype.scrollToUp = function() { this.startScroll(90) }
simpleScroll.prototype.scrollToDown = function() { this.startScroll(270) }
simpleScroll.prototype.scrollToLeft = function() { this.startScroll(180) }
simpleScroll.prototype.scrollToRight = function() { this.startScroll(0) }

simpleScroll.prototype.scrollNorth = function() { this.startScroll(90) }
simpleScroll.prototype.scrollSouth = function() { this.startScroll(270) }
simpleScroll.prototype.scrollWest = function() { this.startScroll(180) }
simpleScroll.prototype.scrollEast = function() { this.startScroll(0) }

simpleScroll.prototype.scrollableUpDown = function() {
  return this.scrollH>0;
}

simpleScroll.prototype.scrollableLeftRight = function() {
  return this.scrollW>0;
}

simpleScroll.prototype.startScroll = function(deg, speed) {
   if (this.loaded)
   {
      if (this.aniTimer) window.clearTimeout(this.aniTimer);
      this.overrideScrollAngle(deg);
      this.speed = speed ? speed : this.origSpeed;
      this.lastTime = (new Date()).getTime() - this.y.minRes;
      this.aniTimer = window.setTimeout(this.gRef + ".scroll()", this.y.minRes);
   }
}

simpleScroll.prototype.endScroll = function() {
   if (this.loaded)
   {
      window.clearTimeout(this.aniTimer);
      this.aniTimer = 0;
      this.speed = this.origSpeed;
   }
}

simpleScroll.prototype.overrideScrollAngle = function(deg) {
   if (this.loaded)
   {
      deg = deg % 360;
      if (deg % 90 == 0) {
         var cos = deg == 0 ? 1 : deg == 180 ? -1 : 0;
         var sin = deg == 90 ? -1 : deg == 270 ? 1 : 0;
      } else {
         var angle = deg * Math.PI / 180;
         var cos = Math.cos(angle);
         var sin = Math.sin(angle);
         sin = -sin;
      }
      this.fx = cos / (Math.abs(cos) + Math.abs(sin));
      this.fy = sin / (Math.abs(cos) + Math.abs(sin));
      this.stopH = deg == 90 || deg == 270 ? this.scrollLeft : deg < 90 || deg > 270 ? this.scrollW : 0;
      this.stopV = deg == 0 || deg == 180 ? this.scrollTop : deg < 180 ? 0 : this.scrollH;
   }
}

simpleScroll.prototype.overrideScrollSpeed = function(speed) {
   if (this.loaded) this.speed = speed;
}

simpleScroll.prototype.scrollTo = function(stopH, stopV, aniLen) {
   if (this.loaded)
   {
      if (stopH != this.scrollLeft || stopV != this.scrollTop) {
         if (this.aniTimer) window.clearTimeout(this.aniTimer);
         this.lastTime = (new Date()).getTime();
         var dx = Math.abs(stopH - this.scrollLeft);
         var dy = Math.abs(stopV - this.scrollTop);
         var d = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));
         this.fx = (stopH - this.scrollLeft) / (dx + dy);
         this.fy = (stopV - this.scrollTop) / (dx + dy);
         this.stopH = stopH;
         this.stopV = stopV;
         this.speed = d / aniLen * 1000;
         window.setTimeout(this.gRef + ".scroll()", this.y.minRes);
      }
   }
}

simpleScroll.prototype.jumpTo = function(nx, ny) {
   if (this.loaded)
   {
      nx = Math.min(Math.max(nx, 0), this.scrollW);
      ny = Math.min(Math.max(ny, 0), this.scrollH);
      this.scrollLeft = nx;
      this.scrollTop = ny;
      if (this.y.ns4) this.content.moveTo(-nx, -ny);
      else {
         this.content.style.left = -nx + "px";
         this.content.style.top = -ny + "px";
      }
   }
}

simpleScroll.minRes = 10;
simpleScroll.ie = document.all ? 1 : 0;
simpleScroll.ns4 = document.layers ? 1 : 0;
simpleScroll.dom = document.getElementById ? 1 : 0;
simpleScroll.mac = navigator.platform == "MacPPC";
simpleScroll.mo5 = document.getElementById && !document.all ? 1 : 0;

simpleScroll.prototype.scroll = function() {
   this.aniTimer = window.setTimeout(this.gRef + ".scroll()", this.y.minRes);
   var nt = (new Date()).getTime();
   var d = Math.round((nt - this.lastTime) / 1000 * this.speed);
   if (d > 0)
   {
      var nx = d * this.fx + this.scrollLeft;
      var ny = d * this.fy + this.scrollTop;
      var xOut = (nx >= this.scrollLeft && nx >= this.stopH) || (nx <= this.scrollLeft && nx <= this.stopH);
      var yOut = (ny >= this.scrollTop && ny >= this.stopV) || (ny <= this.scrollTop && ny <= this.stopV);
      if (nt - this.lastTime != 0 &&
            ((this.fx == 0 && this.fy == 0) ||
             (this.fy == 0 && xOut) ||
             (this.fx == 0 && yOut) ||
             (this.fx != 0 && this.fy != 0 && xOut && yOut)))
      {
         this.jumpTo(this.stopH, this.stopV);
         this.endScroll();
      } else {
         this.jumpTo(nx, ny);
         this.lastTime = nt;
      }
   }
}

function simpleScroll(id, width, height)
{
   var left = 0;
   var top = 0;
   var speed = 40;
   var contentWidth = width;
   var contentHeight = height;
   var initLeft = 0;
   var initTop = 0;
   var y = this.y = simpleScroll;
   if (!initLeft) initLeft = 0;
   if (!initTop) initTop = 0;
   if (!contentWidth) contentWidth = width;
   if (!contentHeight) contentHeight = height;
   if (document.layers && !y.ns4) history.go(0);
   if (y.ie || y.ns4 || y.dom) {
      this.loaded = false;
      this.id = id;
      this.origSpeed = speed;
      this.aniTimer = false;
      this.op = "";
      this.lastTime = 0;
      this.clipH = height;
      this.clipW = width;
      this.scrollTop = initTop;
      this.scrollLeft = initLeft;
      this.gRef = "simpleScroll_"+id;
      eval(this.gRef + "=this");
      var d = document;
      d.write('<style type="text/css">');
      d.write('#' + this.id + 'Zone { position:relative; width:' + width + 'px; height:' + height + 'px; }');
      d.write('#' + this.id + 'Container { left:' + left + 'px; top:' + top + 'px; width:' + width + 'px; height:' + height + 'px; clip:rect(0 ' + width + ' ' + height + ' 0); overflow:hidden; }');
      d.write('#' + this.id + 'Container, #' + this.id + 'Content { position:absolute; }');
      //d.write('#' + this.id + 'Content { left:' + (-initLeft) + 'px; top:' + (-initTop) + 'px; width:' + contentWidth + 'px; }');
      d.write('</style>');
   }
}

simpleScroll.prototype.load = function() {
   var d, lyrId1, lyrId2;
   d = document;
   lyrId1 = this.id + "Container";
   lyrId2 = this.id + "Content";
   this.container = this.y.dom ? d.getElementById(lyrId1) : this.y.ie ? d.all[lyrId1] : d.layers[lyrId1];
   this.content = obj2 = this.y.ns4 ? this.container.layers[lyrId2] : this.y.ie ? d.all[lyrId2] : d.getElementById(lyrId2);
   this.docH = Math.max(this.y.ns4 ? this.content.document.height : this.content.offsetHeight, this.clipH);
   this.docW = Math.max(this.y.ns4 ? this.content.document.width : this.content.offsetWidth, this.clipW);
   this.scrollH = this.docH - this.clipH;
   this.scrollW = this.docW - this.clipW;
   this.loaded = true;
   this.scrollLeft = Math.max(Math.min(this.scrollLeft, this.scrollW), 0);
   this.scrollTop = Math.max(Math.min(this.scrollTop, this.scrollH), 0);
   this.jumpTo(this.scrollLeft, this.scrollTop);
}