var btnl1 = new Image();
var btnl2 = new Image();
var btfr1 = new Image();
var btfr2 = new Image();
var bten1 = new Image();
var bten2 = new Image();


btnl1.src = "images/nl1.gif";
btnl2.src = "images/nl2.gif";
btfr1.src = "images/fr1.gif";
btfr2.src = "images/fr2.gif";
bten1.src = "images/en1.gif";
bten2.src = "images/en2.gif";



function nlOn() 
{
document.btnl1.src=btnl1.src;
}

function nlOver() 
{
document.btnl1.src=btnl2.src;
}

function frOn() 
{
document.btfr1.src=btfr1.src;
}

function frOver() 
{
document.btfr1.src=btfr2.src;
}

function enOn() 
{
document.bten1.src=bten1.src;
}

function enOver() 
{
document.bten1.src=bten2.src;
}