function Marquee(box,content,speed,dirc,coefOverSpeed){
	//ini les variables
	this.box=$(box);
	this.content=$(content);
	this.speed=speed || 1;
	this.dirc=dirc || 'top';
	this.coefDirc=1;
	this.coefOverSpeed=coefOverSpeed || 3;
	this.inverseDirc=(this.dirc=='bottom' || this.dirc=='right');
	var horizontalDirc=(this.dirc=='bottom' || this.dirc=='top');
	
	//on repositionne les élements + cache les scrolls 
	this.box.style.overflow='hidden';
	this.box.style.position='relative';//ie7 bug
	this.content.style.position='relative';
	
	//calcule la dimension du conteneur  + la dimention du contenue 
	var boxDim=this.box['client'+(horizontalDirc?'Height':'Width')];
	var contentDim=this.content['offset'+(horizontalDirc?'Height':'Width')];
	
	//on retient la moitier de la dim , pour le mouse over
	this.middleDim=boxDim/2;
	
	//on definit las position max et de départ
	this.maxDim=this.inverseDirc?-boxDim:-contentDim;
	this.startStep=this.inverseDirc?contentDim:boxDim;
	this.currentStep=this.startStep;
	
	//ajoutes les evenemnts
	this.eventOver=this.onMouseover.bindAsEventListener(this);
	Event.observe(this.box,'mouseover',this.eventOver);
	
	this.eventOut=this.onMouseout.bindAsEventListener(this);
	Event.observe(this.box,'mouseout',this.eventOut);
	
	this.interval=setInterval(this.interval.bind(this),35);
	
	this.eventUnload=this.unload.bindAsEventListener(this);
	Event.observe(window,'unload',this.eventUnload.bind(this));
	}
	Marquee.prototype={
		onMouseout : function(e){
		Event.stopObserving(this.box,'mousemove',this.eventMouseMove);
		this.coefDirc=1;
	},
	onMouseover : function(e){
		var dim=Element.viewportOffset(this.box);
		if(this.dirc=='top' || this.dirc=='bottom'){
			this.coor=[dim[1],dim[1]+this.box.clientHeight];
		}else this.coor=[dim[0],dim[0]+this.box.clientWidth];
		this.mouseMove(e);
		this.eventMouseMove=this.mouseMove.bindAsEventListener(this);
		Event.observe(this.box,'mousemove',this.eventMouseMove);
		},
		interval : function(){
		var acc=this.speed*this.coefDirc;
		$(this.content).style[this.dirc]=this.currentStep-acc+'px';
		this.currentStep-=acc;
		if(this.currentStep>this.startStep)
			this.currentStep=this.maxDim;
		if(this.inverseDirc){
			if(this.currentStep<this.maxDim)
			this.currentStep=this.startStep;
			}else{
		if(this.currentStep<this.maxDim)
			this.currentStep=this.startStep;
		}
	},
	mouseMove:function(e){
		if(this.dirc=='top' || this.dirc=='bottom'){
			var mouseCoor=Event.pointer(e).y;
		}else var mouseCoor=Event.pointer(e).x;
		var inverseCoeff=(mouseCoor-this.coor[0]>this.coor[1]-mouseCoor);
		var coef=inverseCoeff?this.coor[1]-mouseCoor:mouseCoor-this.coor[0];
		this.coefDirc=((this.middleDim-coef)/this.middleDim)*this.coefOverSpeed;
		if(inverseCoeff)this.coefDirc=-this.coefDirc;
		if(this.inverseDirc)this.coefDirc=-this.coefDirc;
		},
		unload : function(){
		clearInterval(this.interval);
		Event.stopObserving(this.box,'mouseover',this.eventOver);
		Event.stopObserving(this.box,'mouseout',this.eventOut);
		Event.stopObserving(window,'unload',this.eventUnload.bind(this));    
		}
	}