function showhide(layer_ref, state) { 
if (document.all) {eval( "document.all." + layer_ref + ".style.display = state");} 
if (document.layers) {document.layers[layer_ref].display = state;} 
if (document.getElementById && !document.all) {doktor = document.getElementById(layer_ref); doktor.style.display = state;} 
}