var n = navigator;
var d = document;
var speed = 40;
var agent = n.userAgent.toLowerCase();
var tid, b;


//Browser sniff hash obj
var sniff = {
bw: {
ns:d.layers,
ie:d.all && !d.getElementById,
ie4:agent.indexOf("msie 4.") != -1,
ie5:agent.indexOf("msie 5.") != -1,
ie6:agent.indexOf("msie 6.") != -1,
dom:d.getElementById,
ns6:d.getElementById && agent.indexOf("gecko") != -1
},
os: {
win:agent.indexOf("win") != -1,
mac:agent.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 scrollDown(num) {
var obj = (eval("scroller" + num));
b = true;
if (obj.container.height < obj.content.height) {
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 {
stop();
}
} 

function scrollUp(num) {
var obj = (eval("scroller" + num));
b = true;
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');
}