function showLAYER(layName) {
if (document.getElementById) {
document.getElementById(layName).style.visibility = 'visible'

}else if (document.all) {
document.all(layName).style.visibility = 'visible'

}else if (document.layers) {
document.layers[layName].visibility = 'show'
}

}

function hideLAYER(layName) {

if (document.getElementById) {
document.getElementById(layName).style.visibility = 'hidden'

}else if (document.all) {
document.all(layName).style.visibility = 'hidden'

}else if (document.layers) {
document.layers[layName].visibility = 'hide'
}

}