if (document.location.search) {
var layer_name = document.location.search.replace("?","");
var i =0;
for (i=0; i<(layers.length); i+=1) {
var state = 'hidden';
if (layer_name == layers[i]) {
var state = 'visible';
}

eval("document.all." + layers[i] + ".style.visibility = state");

}
}