function showHideLayers() {
    var i, visStr, args, theObj;
    var layerActif = '';
    var theObjActif;
    var variable ;
    args = showHideLayers.arguments;

    Hide3Layer();
    visStr   = args[1];
    if (document.layers)
    {
        variable = "document.layers['" + args[0] + "']";
        theObj = eval(variable);
        if (theObj)
        {
            theObj.visibility = visStr;
            theObj.zIndex = 1 ;
        }
    }
    else
    {
        if (document.getElementById)
        {
            theObj = document.getElementById(args[0]);
        }
        else if (document.all)
        {
            //IE ???
            variable = "document.all['" + args[0] + "']";
            theObj = eval(variable);
        }         
        if (theObj)
        {
            with (theObj.style) {
                visibility = visStr == 'show' ? 'visible' : 'hidden';
                zIndex = 1 ;
            }
        }
    }
}
function HideAllLayer()
{

    if (navigator.appName == 'Netscape' && document.layers != null)
    {
	   for (i=0  ; i <= document.layers.length - 1 ; i++)
	   {
		  document.layers[i].visibility='hide';
	   }

    }
    else if (document.all != null)
    {
	   var allDIVs = document.all.tags("DIV")
	   for (var i = 0; i <= allDIVs.length - 1; i++)
	   {
	       allDIVs[i].style.visibility='hidden'
	   }
    }
}

function Hide3Layer()
{

    if (navigator.appName == 'Netscape' && document.layers != null)
    {
	   console.log(document.layers);
       document.services.visibility='hide';
	   document.societe.visibility='hide';
	   document.contacts.visibility='hide';
    }
    else if (document.getElementById)
    {
        // nice browsers
        document.getElementById('services').style.visibility='hidden';
        document.getElementById('societe').style.visibility='hidden';
        document.getElementById('contacts').style.visibility='hidden';
    }
    else if (document.all != null)
    {
       document.all.services.style.visibility='hidden'
	   document.all.societe.style.visibility='hidden'
	   document.all.contacts.style.visibility='hidden'
    }
}