// Image alternate par onmouseover

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();
img11on = new Image();
img11off  = new Image();
img12on = new Image();
img12off  = new Image();
img13on = new Image();
img13off  = new Image();
img14on = new Image();
img14off  = new Image();
img15on = new Image();
img15off  = new Image();


img1on.src = "images/bthome1.gif";
img1off.src = "images/bthome.gif";
img2on.src = "images/btoff1.gif";
img2off.src = "images/btoff.gif";
img3on.src = "images/btroad1.gif";
img3off.src = "images/btroad.gif";
img4on.src = "images/btcont1.gif";
img4off.src = "images/btcont.gif";
img5on.src = "images/btbg1.gif";
img5off.src = "images/btbg.gif";
img6on.src = "images/btass1.gif";
img6off.src = "images/btass.gif";
img7on.src = "images/btsel1.gif";
img7off.src = "images/btsel.gif";
img8on.src = "images/btimp1.gif";
img8off.src = "images/btimp.gif";
img9on.src = "images/btmon1.gif";
img9off.src = "images/btmon.gif";
img10on.src = "images/moreinf1.gif";
img10off.src = "images/moreinf.gif";
img11on.src = "images/more1.gif";
img11off.src = "images/more.gif";
img12on.src = "images/btwork1.gif";
img12off.src = "images/btwork.gif";
img13on.src = "images/btstruct1.gif";
img13off.src = "images/btstruct.gif";
img14on.src = "images/btdet1.gif";
img14off.src = "images/btdet.gif";
img15on.src = "images/btnstep1.gif";
img15off.src = "images/btnstep.gif";

}
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; img10off  = 0;
img11on = 0; img11off  = 0;
img12on = 0; img12off  = 0;
img13on = 0; img13off  = 0;
img14on = 0; img14off  = 0;
img15on = 0; img15off  = 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;}
	}