if (navigator.platform=="MacPPC") Venv="mac";
	else Venv ="autre";
	if (Venv == "mac") hauteur_interligne_contenu = 9;
	else hauteur_interligne_contenu = 10;
	if (document.getElementById &&  parseInt(navigator.appVersion)>=5) Vnav = "NS6";
	else if (navigator.appName.indexOf("Netscape") != -1 || navigator.appName=="Netscape") Vnav = "NS4";
	else Vnav="IE";
	var relpath="";
	
	preloadOn=new Array();
	preloadOn["nav2"]=new Image();
	preloadOn["nav2"].src=relpath+"menu_img/home_on.gif";
	preloadOn["nav3"]=new Image();
	preloadOn["nav3"].src=relpath+"menu_img/presentation_on.gif";
	preloadOn["nav4"]=new Image();
	preloadOn["nav4"].src=relpath+"menu_img/vue_gen_on.gif";
	preloadOn["nav5"]=new Image();
	preloadOn["nav5"].src=relpath+"menu_img/codes_on.gif";
	preloadOn["nav6"]=new Image();
	preloadOn["nav6"].src=relpath+"menu_img/Qualif_on.gif";
	preloadOn["nav7"]=new Image();
	preloadOn["nav7"].src=relpath+"menu_img/doc_on.gif";
	preloadOn["nav8"]=new Image();
	preloadOn["nav8"].src=relpath+"menu_img/form_on.gif";
	preloadOn["nav9"]=new Image();
	preloadOn["nav9"].src=relpath+"menu_img/liens_on.gif";
	preloadOut=new Array();
	preloadOut["nav2"]=new Image();
	preloadOut["nav2"].src=relpath+"menu_img/home_off.gif";
	preloadOut["nav3"]=new Image();
	preloadOut["nav3"].src=relpath+"menu_img/presentation_off.gif";
	preloadOut["nav4"]=new Image();
	preloadOut["nav4"].src=relpath+"menu_img/vue_gen_off.gif";
	preloadOut["nav5"]=new Image();
	preloadOut["nav5"].src=relpath+"menu_img/codes_off.gif";
	preloadOut["nav6"]=new Image();
	preloadOut["nav6"].src=relpath+"menu_img/Qualif_off.gif";
	preloadOut["nav7"]=new Image();
	preloadOut["nav7"].src=relpath+"menu_img/doc_off.gif";
	preloadOut["nav8"]=new Image();
	preloadOut["nav8"].src=relpath+"menu_img/form_off.gif";
	preloadOut["nav9"]=new Image();
	preloadOut["nav9"].src=relpath+"menu_img/liens_off.gif";

	
	function rollon(nomImg)
		{
		document.images[nomImg].src=preloadOn[nomImg].src;
		}
	function rollout(nomImg)
		{
		document.images[nomImg].src=preloadOut[nomImg].src;
		}
	var relpath="";
	puceon = new Image();
	puceon.src=relpath+"menu_img/puce_on.gif";
	puceoff = new Image();
	puceoff.src=relpath+"menu_img/puce_off.gif";
	function puceRollOn(noImg)
		{
		nomImg="puce"+noImg;
		document.images[nomImg].src=puceon.src;
		}
	
	function puceRollOff(noImg)
		{
		nomImg="puce"+noImg;
		document.images[nomImg].src=puceoff.src;
		}
	
	
	function winopen(lien,largeur,hauteur)
		{
		void window.open(lien,"popup","height="+hauteur+",width="+largeur+",resizable=yes,dependent=no,menubar=no,location=no,titlebar=yes,toolbar=no,scrollbars=yes,statusbar=yes");
		}