function positionne(p_id){

	var windowWidth  = window.innerWidth;
	var windowHeight = window.innerHeight;
	
	var object       = document.getElementById(p_id);
	var popupWidth   = object.offsetWidth;
	var popupHeight  = object.offsetHeight;
	
	var x = (windowWidth - popupWidth) / 2;
	var y = (windowHeight - popupHeight) / 2;
	
	object.style.left = y;
	object.style.top = x;
}
/*function positionne(p_id, p_posX, p_pos_Y){
document.getElementById(p_id).style.left = p_posX;
document.getElementById(p_id).style.top = p_pos_Y;
}*/

function getPositionCurseur(e){
//ie
if(document.all){
curX = event.clientX;
curY = event.clientY;
}

//netscape 4
if(document.layers){
curX = e.pageX;
curY = e.pageY;
}

//mozilla
if(document.getElementById){
curX = e.clientX;
curY = e.clientY;
}
}

function beginDrag(p_obj,e){
isDragging = true;
objectToDrag = p_obj;
getPositionCurseur(e);
ecartX = curX - parseInt(objectToDrag.style.left);
ecartY = curY - parseInt(objectToDrag.style.top);
}

function drag(e){
var newPosX;
var newPosY;
if(isDragging == true){

getPositionCurseur(e);
newPosX = curX - ecartX;
newPosY = curY - ecartY;

objectToDrag.style.left = newPosX + 'px';
objectToDrag.style.top = newPosY + 'px';
}

}

function endDrag(){
isDragging = false;
}