Scroller.prototype.move=function() {
	if (this.mode) {
		this.top += (-this.top>=this.cheight ? this.cheight: 0)+this.step;
		for (var c=0;c<this.container.length;c++)
			this.container[c].style.top=this.top+'px';
	}
}
Scroller.prototype.setMode=function(mode) {
	this.mode=mode;
}

function Scroller(el,time,step) {
	this.element=el;
	this.width  = parseInt(this.element.offsetWidth);
	this.height = parseInt(this.element.offsetHeight);
	this.top=0;
	this.mode=1;
	this.step=step;


	this.element.style.overflow='hidden';
	this.element.style.position='relative';
	this.element.style.top='0px';


	// copy element content into master
	var content = this.element.childNodes;
	var master = document.createElement('div');
	master.style.position='relative';
	for (t=0;t<content.length;t++) {
			master.appendChild(content[t].cloneNode(true));
	}
	
	// delete element content
	for (t=content.length-1;t>=0;t--)
	child = this.element.removeChild(content[t]);
	// copy master node c-times (at least 2) to fill the box
	var c=0,ready=false;
	this.container= new Array();
	while (!ready) {
		this.container[c]=master.cloneNode(true);
		this.element.appendChild(this.container[c]);
		c++;
		if (c==2)
			this.cheight=parseInt(this.container[1].offsetTop)-parseInt(this.container[0].offsetTop);
		if (this.cheight)
			ready = (this.height<this.cheight*c);
	}
	window.setInterval2(this,'move',0,time);

	var myLinks = this.element.getElementsByTagName('a');
	addEvent(myLinks,'mouseover', callLater(this,'setMode',0));
	addEvent(myLinks,'mouseout',  callLater(this,'setMode',1));

}

addLoadEvent(
	function(e) {
		map(getElementsByClass('scroll_up','div'),function (e) {new Scroller(e,200,-1);});
	}
);