var n = navigator;
var d = document;
var agent = n.userAgent.toLowerCase();
var name = n.appName.toLowerCase();
var opera = agent.indexOf("opera") != -1;
var speed = 40;
var tid;

var sniff = {
  bw: {
 	ie:agent.indexOf("msie") != -1 && !opera,
	ie4:agent.indexOf("msie 4.") != -1 && !opera,
	ie5:agent.indexOf("msie 5.") != -1 && !opera,
	ie6:agent.indexOf("msie 6.") != -1 && !opera,
	ns:name.indexOf("netscape") != -1 && agent.indexOf("gecko") == -1,
	ns6:agent.indexOf("netscape6") != -1
  },
  os: {
	win:n.userAgent.indexOf("Win") != -1,
	mac:n.userAgent.indexOf("Mac") != -1
  }
};

var distance = (sniff.os.mac && sniff.bw.ns6 || sniff.os.win && sniff.bw.ie4)?5:(sniff.os.mac && sniff.bw.ns)?6:4;

function createScrollerObj ( lyr1, lyr2) {
  this.container = {
	obj:(sniff.bw.ns)?d[lyr1]:sniff.bw.ie?d.all[lyr1]:d.getElementById(lyr1),
	css:(sniff.bw.ns)?d[lyr1]:sniff.bw.ie?d.all[lyr1].style:d.getElementById(lyr1).style,
	height:(sniff.bw.ns)?d[lyr1].clip.height:sniff.bw.ie?d.all[lyr1].offsetHeight:d.getElementById(lyr1).offsetHeight
  };
  this.content = {
	obj:(sniff.bw.ns)?d[lyr1].document[lyr2]:sniff.bw.ie?d.all[lyr2]:d.getElementById(lyr2),
	css:(sniff.bw.ns)?d[lyr1].document[lyr2]:sniff.bw.ie?d.all[lyr2].style:d.getElementById(lyr2).style,
	height:(sniff.bw.ns)?d[lyr1].document[lyr2].clip.height:sniff.bw.ie?d.all[lyr2].offsetHeight:d.getElementById(lyr2).offsetHeight,
	move:moveLyr,
	top:0
  };
  this.prop = {
	dif:this.container.height - this.content.height
  };
  
  return this;
}

//move something
function moveLyr ( x, y) {
  this.css.left = x;
  this.css.top = y;
}

function setTop ( num, top) {
  var obj = ( eval ( "scroller" + num));
  obj.content.top = top;
  obj.content.move(0, top);
}

function scrollDown ( num) {
  var obj = (eval("scroller" + num));
  if (obj.container.height < (obj.content.height + obj.content.top)) {
	obj.content.move(0, (parseInt(obj.content.top) - distance));
	if (parseInt(obj.content.top) >= parseInt(obj.prop.dif)) {
	  tid = setTimeout("scrollDown('" + num + "')", speed);
	}
	obj.content.top = parseInt(obj.content.top) - distance;
  } else {
	stopScroll();
  }
}

function scrollUp ( num) {
  var obj = (eval("scroller" + num));
  if ( parseInt(obj.content.top) != 0) {
	obj.content.move(0, (parseInt(obj.content.top) + distance));
	obj.content.top = parseInt(obj.content.top) +distance;
	tid = setTimeout("scrollUp('" + num + "')", speed);
  }
}

function stopScroll() {
  clearTimeout ( tid);
  b = false
}

function createObj() {
  scroller1 = new createScrollerObj ( 'divContainer', 'divContent');
}

function nsBrowFix () {
  if ( pageWidth!=innerWidth || pageHeight!=innerHeight) {
    location.reload()
  }
}

if ( document.layers) {
  pageWidth=innerWidth
  pageHeight=innerHeight
  window.onresize=nsBrowFix
}