function on1()
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document.images[5].src="images/on1.jpg";
}

function on2()
{
document.images[5].src="images/on2.jpg";
}

function on3()
{
document.images[5].src="images/on3.jpg";
}

function on4()
{
document.images[5].src="images/on4.jpg";
}

function on5()
{
document.images[5].src="images/on5.jpg";
}

function on6()
{
document.images[5].src="images/on6.jpg";
}

function on7()
{
document.images[5].src="images/on7.jpg";
}

function on8()
{
document.images[5].src="images/on8.jpg";
}

function off()
{
document.ahoj.src="images/off.jpg";
}