function mouseOver1()
{
document.b1.src ="img/home2.jpg"
}
function mouseOut1()
{
document.b1.src ="img/home1.jpg"
}

function mouseOver2()
{
document.b2.src ="img/oferta2.jpg"
}
function mouseOut2()
{
document.b2.src ="img/oferta1.jpg"
}

function mouseOver3()
{
document.b3.src ="img/kontakt2.jpg"
}
function mouseOut3()
{
document.b3.src ="img/kontakt1.jpg"
}