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

ypSimpleScroll.prototype.startScroll = function(deg, count) {

  if (this.loaded) {

    if (this.aniTimer)  window.clearTimeout(this.aniTimer);
    this.overrideScrollAngle(deg);
    this.speed = this.origSpeed;
    this.lastTime = (new Date()).getTime() - this.y.minRes;
    this.aniTimer = window.setTimeout(this.gRef + ".scroll('"+deg+"','"+count+"')", this.y.minRes);

  }

}

ypSimpleScroll.prototype.endScroll = function() {

  if (this.loaded) {

    window.clearTimeout(this.aniTimer);
    this.aniTimer = 0;
    this.speed = this.origSpeed;

  }

}

ypSimpleScroll.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;

  }

}

ypSimpleScroll.prototype.overrideScrollSpeed = function(speed) {

  if (this.loaded) this.speed = speed;

}


ypSimpleScroll.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);

    }

  }

}

ypSimpleScroll.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";

    }

  }

}

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

ypSimpleScroll.prototype.scroll = function(deg,count) {

  this.aniTimer = window.setTimeout(this.gRef + ".scroll('"+deg+"','"+count+"')", 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;

    }
    // (zgtc) now we also update dragger position:
    if(deg=='270') {
    
      theThumb[count].style.top = parseInt(((theThumb[count].maxY-theThumb[count].minY)*this.scrollTop/this.stopV)+theThumb[count].minY) + "px";
      //ok nomes down

    }
    if(deg=='90') theThumb[count].style.top = parseInt(((theThumb[count].maxY-theThumb[count].minY)*this.scrollTop/this.scrollH)+theThumb[count].minY) + "px";
    //ok nomes down

  }

}

function ypSimpleScroll(id, left, top, width, height, speed) {

  var y = this.y = ypSimpleScroll;
  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 = 0;
      this.scrollLeft = 0;
      this.gRef = "ypSimpleScroll_"+id;
      eval(this.gRef+"=this");
      var d = document;
      d.write('<style type="text/css">');
      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:' + (-this.scrollLeft) + 'px; top:' + (-this.scrollTop) + 'px; width:' + width + 'px; }');
      // (zgtc) fix to overwrite p/div/ul width (would be clipped if wider than scroller in css):
      d.write('#' + this.id + 'Container p, #' + this.id + 'Container div {width:' + parseInt(width-10) + 'px; }');
      d.write('</style>');
    }

}

ypSimpleScroll.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);

}