function hideLayer() {

if (document.getElementById) {
// this is the way the standards work
document.getElementById('season-effect').style.visibility = "hidden";
}
else if (document.all) {
// this is the way old msie versions work
document.all['season-effect'].style.visibility = "hidden";
}
else if (document.layers) {
// this is the way nn4 works
document.layers['season-effect'].visibility = "hidden";
}

}