if (document.images) {
im1on = new Image(); im1on.src = "alkuun_1.gif";
im1off = new Image(); im1off.src = "alkuun_2.gif";
im2on = new Image(); im2on.src = "esittely_1.gif";
im2off = new Image(); im2off.src = "esittely_2.gif";
im3on = new Image(); im3on.src = "ajankohtaista_1.gif";
im3off = new Image(); im3off.src = "ajankohtaista_2.gif";
im4on = new Image(); im4on.src = "oulunluonto_1.gif";
im4off = new Image(); im4off.src = "oulunluonto_2.gif";
im5on = new Image(); im5on.src = "retkikerho_1.gif";
im5off = new Image(); im5off.src = "retkikerho_2.gif";
im6on = new Image(); im6on.src = "linkit_1.gif";
im6off = new Image(); im6off.src = "linkit_2.gif";
im7on = new Image(); im7on.src = "english_1.gif";
im7off = new Image(); im7off.src = "english_2.gif";
im8on = new Image(); im8on.src = "kalenteri_1.gif";
im8off = new Image(); im8off.src = "kalenteri_2.gif";
}


function imgOn (imgName){
if (document.images){
document[imgName].src = eval(imgName + "on.src");
}
}

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