v=0;
whichbrowser = navigator.appName;
ver = parseInt(navigator.appVersion);
if ( (whichbrowser == "Netscape" && ver >= 3) || ver == 4 ){v=1;}

ns = (document.layers)? true:false
ie = (document.all)? true:false

ns4 = (document.layers)? true:false
ie4 = (document.all && !document.getElementById)? true:false
dom = (document.getElementById)? true:false

if (ns4){layerRef="document.layers['";		styleSwitch="']";	layerStyleRef=".document";}
if (ie4){layerRef="document.all['";		styleSwitch="'].style";	layerStyleRef="";}
if (dom){layerRef="document.getElementById('";	styleSwitch="').style";	layerStyleRef="";}

function montre(layerName)	{eval(layerRef+layerName+styleSwitch+'.visibility = "visible"')}
function cache(layerName)	{eval(layerRef+layerName+styleSwitch+'.visibility = "hidden"')}
function xpos(layerName)	{return parseInt(eval(layerRef+layerName+styleSwitch+'.left'));}
function ypos(layerName)	{return parseInt(eval(layerRef+layerName+styleSwitch+'.top'));}
function tox(layerName,x)	{eval(layerRef+layerName+styleSwitch+'.left = '+x);}
function toy(layerName,y)	{eval(layerRef+layerName+styleSwitch+'.top = '+y);}
function byx(layerName,x)	{eval(layerRef+layerName+styleSwitch+'.left = '+xpos(layerName)+'+'+x);}
function byy(layerName,y)	{eval(layerRef+layerName+styleSwitch+'.top = '+ypos(layerName)+'+'+y);}

if(ns4)	document.write('<LINK REL="stylesheet" HREF="style_ns.css" TYPE="text/css">')
else	document.write('<LINK REL="stylesheet" HREF="style_ie.css" TYPE="text/css">')


img1on = new Image();        
img1on.src ="img/retour_on.gif";
img1off = new Image();        
img1off.src ="img/retour_off.gif";  

img2on = new Image();        
img2on.src ="img/question_on.gif";
img2off = new Image();        
img2off.src ="img/question_off.gif";  



function change_img(img_name,img_var){

	img=eval(img_var+".src");
	document[img_name].src=img;
	
}