function findPos(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
	do {
			curleft += obj.offsetLeft;
			curtop += obj.offsetTop;
	} while (obj = obj.offsetParent);
	alert('left : '+curleft+'top : '+curtop);
}
}

function fsetPosition(div,x,y)
{
   var obj = document.getElementById(div);
   obj.style.left=x+'px';
   obj.style.top=y+'px';
   
}


function chapeau(id1, id2){


var xlenght = ylenght = 0;

if (document.getElementById(id1)){

obj1 = document.getElementById(id1);
obj2 = document.getElementById(id2);
ylenght = obj1.offsetHeight;
xlenght = obj1.offsetWidth;
obj2.style.width = xlenght-54+'px';

}

}

function setVisible(obj) {
var obj = document.getElementById(obj);
obj.style.display='block';
}

function setUnvisible(name) {
var obj = document.getElementById(name);
obj.style.display='none';
}


function dessus(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
	do {
			curleft += obj.offsetLeft;
			curtop += obj.offsetTop;
	} while (obj = obj.offsetParent);
	curtop = curtop-81;
fsetPosition("extra_top",curleft,curtop);
setVisible('extra_top');
}
}