//-- compatibleBlowser
function compatibleBlowser () {
	this.ver = navigator.appVersion;
	this.dom = (document.getElementById) ? 1 : 0;
	this.ie5 = (this.ver.indexOf("MSIE") > -1 && this.dom) ? 1 : 0;
	this.ie4 = (document.all && !this.dom) ? 1 : 0;
	this.ns5 = (this.dom && parseInt(this.ver) >= 5) ? 1 : 0;
	this.ns4 = (document.layers && !this.dom) ? 1 : 0;
	this.bwf  = (this.ie5 || this.ie4 || this.ns5 || this.ns4);
	return this;
}
bw = new compatibleBlowser();
//alert(bw.ver);
//alert(bw.dom);
//alert(bw.bwf);

var mySpeed = 40;
var timer;

function moveArea(x,y){
	this.x = x;
	this.y = y;
	this.css.top    = this.y;
	this.css.height = this.x;
}

function moveAreaUp(e){
	if(this.y > (objContainer.clipHeight - this.scrollHeight)){
		this.movearea(0,this.y+e);
		if(loop){
			timer = setTimeout(this.objname + '.up(' + e + ')',mySpeed);
		}
	}
}

function moveAreaDown (e){
	if(this.y < 0){
		this.movearea(0,this.y+e);
		if(loop){
			timer = setTimeout(this.objname + '.down(' + e + ')' , mySpeed);
		}
	}

}

function scrollStart(speed){
	if(initFlag){
		loop = true;
		if(speed < 0){ objContent.up(speed); }
		else         { objContent.down(speed); }
	}
}

function scrollStop (){
	loop = false;
	if(timer) clearTimeout(timer);
}


function constructObject (obj,nest){
	nest = (!nest) ? '' : 'document.' + nest + '.';
	this.el  = (bw.dom) ? document.getElementById(obj) : 
						 (bw.ie4) ? document.all[obj] : 
						 (bw.ns4) ? eval(nest + 'document.' + obj) : 0;
	this.css = (bw.dom) ? document.getElementById(obj).style :
						 (bw.ie4) ? document.all[obj].style : 
						 (bw.ns4) ? eval(nest + 'document.' + obj) : 0;

	this.scrollHeight = (bw.ns4) ? this.css.clip.height :this.el.offsetHeight;
	this.clipHeight   = (bw.ns4) ? this.css.clip.height :this.el.offsetHeight;

	this.movearea = moveArea;
	this.up       = moveAreaUp;
	this.down     = moveAreaDown;
	this.x;
	this.y;
	this.objname = obj + 'Object';
	eval(this.objname + "=this");
	return this;
}


var initFlag = false;
var loop = false;

function initScrollArea (){
	objContainer = new constructObject('divContainer');
	objContent   = new constructObject('divContent' , 'divContainer');
	objContent.movearea(0,0);
	objContainer.css.visibility = 'visible';
	initFlag = true;
}