browserName=navigator.appName;
browserVer=parseInt(navigator.appVersion);

if ((browserName=="Netscape" && browserVer>=3) || (browserName=="Microsoft Internet Explorer" && browserVer>=4))
	version="n3";
else
	version="n2";

if (version=="n3")
	{
		pic2on= new Image(1,1);
		pic2on.src="icones/tira_tira_on.gif";

		
		pic2off= new Image(1,1);
		pic2off.src="icones/tira_tira.gif";
				

	}

function lightup(imgName)
	{
		if (version=="n3")
			{
				imgOn=eval (imgName + "on.src");
				document[imgName].src= imgOn;
			}
	}		

function turnoff(imgName)
	{
		if (version=="n3")
			{
				imgOff=eval (imgName + "off.src");
				document[imgName].src= imgOff;
			}
	}