var Scroller = Class.create({
	initialize:function(container, content, speed, scrollDelay){
		this.timerID = null;
		this.timer = new Timer(this);
		this.scrollDelay = 15;
		this.speed = 5;
		this.container = null;
		this.content = null;
		this.containerWidth = null;
		this.containerHeight = null;
		this.contentWidth = null;
		this.contentHeight = null;
		this.currentX = 0;
		this.currentY = 0;
		this.offsetX = 0;
		this.offsetY = 0;

		if ( (speed > 0) && (speed <= 10) )
			this.speed = speed;
		if ( (scrollDelay > 0) && (scrollDelay <= 100) )
			this.scrollDelay = scrollDelay;

		this.container = $(container);
		this.content = $(content);
		this.containerWidth = $(container).clientWidth;
		this.containerHeight = $(container).clientHeight;
		this.contentWidth = $(content).clientWidth;
		this.contentHeight = $(content).clientHeight;
	},


	moveUp: function (){
		if ( this.currentY >= 0 ) {
			this.clearTimer();
			return true;
		}
		this.currentY = this.currentY + this.speed;
		this.content.style.top = this.currentY+'px';
		this.timerID = this.startTimer('moveUp');
	},

	moveDown: function(){
		if ( this.offsetY < 0 ||  Math.abs(offsetY) < Math.abs(currentY) ) {
			this.clearTimer();
			return true;
		}
		this.currentY = this.currentY - this.speed;
		this.content.style.top = this.currentY+'px';
		this.timerID = this.startTimer('moveDown');
	},

	moveLeft: function(){
		if ( this.currentX >= 0 ) {
			this.clearTimer();
			return true;
		}
		this.currentX = this.currentX + this.speed;
		this.content.style.left = this.currentX+'px';
		this.timerID = this.startTimer('moveLeft');
	},

	moveRight: function(obj){
		if ( this.offsetX < 0 ||  Math.abs(this.offsetX) < Math.abs(this.currentX) ) {
			this.clearTimer();
			return true;
		}
		this.currentX = this.currentX - this.speed;
		this.content.style.left = this.currentX+'px';
		this.timerID = this.startTimer('moveRight');
	},

	clearTimer: function(){
		this.timer.clearTimeout(this.timerID);
	},

	startTimer: function (functionName){
		this.timerID = this.timer.setTimeout(functionName, this.scrollDelay);
	}
});