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") 
{ 
pic1on= new Image(80,18); 
pic1on.src="image/1-2.gif"; 
pic2on= new Image(80,18); 
pic2on.src="image/2-2.gif"; 
pic3on= new Image(80,18); 
pic3on.src="image/3-2.gif"; 
pic4on= new Image(80,18); 
pic4on.src="image/4-2.gif"; 
pic5on= new Image(80,18); 
pic5on.src="image/5-2.gif"; 
pic6on= new Image(80,18); 
pic6on.src="image/6-2.gif";
pic7on= new Image(80,18); 
pic7on.src="image/7-2.gif";

pic1off= new Image(80,18); 
pic1off.src="image/1-1.gif"; 
pic2off= new Image(80,18); 
pic2off.src="image/2-1.gif"; 
pic3off= new Image(80,18); 
pic3off.src="image/3-1.gif"; 
pic4off= new Image(80,18); 
pic4off.src="image/4-1.gif"; 
pic5off= new Image(80,18); 
pic5off.src="image/5-1.gif"; 
pic6off= new Image(80,18); 
pic6off.src="image/6-1.gif"; 
pic7off= new Image(80,18); 
pic7off.src="image/7-1.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; 
} 
}