// fonction images alternées

browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (  (navigator.appName.substring(0,9) == 'Microsoft') && (navigator.appVersion.substring(0,1) >= '4')  || 
      (navigator.appName.substring(0,9) == 'Netscape')  && (navigator.appVersion.substring(0,1) >= '3')  )
         {
         	version = "n3";
         } else {
         	 version = "old";
         }

if (version == "n3"){
img1on = new Image();
img1off  = new Image();
img2on = new Image();
img2off  = new Image();
img3on = new Image();
img3off  = new Image();
img4on = new Image();
img4off  = new Image();
img5on = new Image();
img5off  = new Image();
img6on = new Image();
img6off  = new Image();
img7on = new Image();
img7off  = new Image();
img8on = new Image();
img8off  = new Image();
img9on = new Image();
img9off  = new Image();
img10on = new Image();
img10off  = new Image();

img1on.src = "images/butagen1.jpg";
img1off.src = "images/butagen.jpg";
img2on.src = "images/butasso1.jpg";
img2off.src = "images/butasso.jpg";
img3on.src = "images/butcont1.jpg";
img3off.src = "images/butcont.jpg";
img4on.src = "images/butecol1.jpg";
img4off.src = "images/butecol.jpg";
img5on.src = "images/buteco1.jpg";
img5off.src = "images/buteco.jpg";
img6on.src = "images/butmair1.jpg";
img6off.src = "images/butmair.jpg";
img7on.src = "images/butjum1.jpg";
img7off.src = "images/butjum.jpg";
img8on.src = "images/butvis1.jpg";
img8off.src = "images/butvis.jpg";
img9on.src = "images/butinf1.jpg";
img9off.src = "images/butinf.jpg";
img10on.src = "images/butmpub1.jpg";
img10off.src = "images/butmpub.jpg";
}
else
{
img1on = 0; img1off  = 0;
img2on = 0; img2off  = 0;
img3on = 0; img3off  = 0;
img4on = 0; img4off  = 0;
img5on = 0; img5off  = 0;
img6on = 0; img6off  = 0;
img7on = 0; img7off  = 0;
img8on = 0; img8off  = 0;
img9on = 0; img9off  = 0;
img10on = 0; img1off  = 0;
}

function imageOn(imgOn,imageNubOn){
	if (version == "n3"){document.images[imageNubOn].src = imgOn.src;}
	}

function imageOff(imgOff, imageNubOff){
	if (version == "n3"){document.images[imageNubOff].src = imgOff.src;}
	}