function calculerPositionAbsolute(elem, idElemRef) {

	var elemParent = elem.offsetParent;	
	var positionX = elem.offsetLeft;
	var positionY = elem.offsetTop; 	


	while(elemParent != null && elemParent.id != idElemRef){
		positionX+= elemParent.offsetLeft;
		positionY+= elemParent.offsetTop;
		elemParent = elemParent.offsetParent;
	}
	return {'X':positionX,'Y':positionY};

}


function positionnerElementAbsolute(elem, positionX, positionY) {
	if(isIE()){
		elem.style.left= positionX;
		elem.style.top = positionY;
	} else {
		elem.style.left= positionX+'px';
		elem.style.top = positionY+'px';
	}
}


function isIE(){
	return (window.attachEvvent);

}