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var agent = navigator.userAgent.toLowerCase();
var ie = ((agent.indexOf("msie") != -1) &&    (agent.indexOf("opera") == -1));

// Renvoie la position absolue d'un élément
function objet_PositionAbsolue(obj)
    {  
    var pos = new Object();  
    pos.gauche = 0;
    pos.haut = 0;  
    if (obj !== null)
        {  
        pos.gauche = obj.offsetLeft;  
        pos.haut = obj.offsetTop;  
          
        var offParent = obj.offsetParent;  
        var nodParent = obj.parentNode;  
  
        while (offParent !== null)
            {  
            if (offParent.nodeName !='FORM') // IE6
                {
                pos.gauche += offParent.offsetLeft;  
                pos.haut += offParent.offsetTop;  
  
                if (offParent != document.body && offParent != document.documentElement)
                    {  
                    pos.gauche -= offParent.scrollLeft;  
                    pos.haut -= offParent.scrollTop;  
                    }  
                // pour autre que IE
                if (!ie)
                    {  
                    while (offParent != nodParent && nodParent !== null)
                        {  
                        pos.gauche -= nodParent.scrollLeft;  
                        pos.haut -= nodParent.scrollTop;  
                      
                        nodParent = nodParent.parentNode;  
                        }      
                    }  

                }
            // Objet suivant
            nodParent = offParent.parentNode;  
            offParent = offParent.offsetParent;  
            
            
            }  
        }  
    return pos;  
    }