<!-- 
if (document.images) 
{ 
pic1on= new Image(62,28); 
pic1on.src="../images/buttons/voltar_over.png"; 
pic1off= new Image(62,28); 
pic1off.src="../images/buttons/voltar_out.png"; 
pic1down=new Image(62,28); 
pic1down.src="../images/buttons/voltar_click.png"; 
} 
{ 
pic2on= new Image(62,28); 
pic2on.src="../images/buttons/voltar_over.png"; 
pic2off= new Image(62,28); 
pic2off.src="../images/buttons/voltar_out.png"; 
pic2down=new Image(62,28); 
pic2down.src="../images/buttons/voltar_click.png"; 
} 
function lightup(imgName) 
{ 
if (document.images) 
{ 
imgOn=eval(imgName + "on.src"); 
document[imgName].src= imgOn; 
} 
} 

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

function clickdown(imgName) 
{ 
if (document.images) 
{ 
imgDown=eval(imgName + "down.src"); 
document[imgName].src=imgDown; 
} 
} 
//-->