function init() {
  IE = (document.all)
  NC = (document.layers)
  Opera = (document.getElementById)
}
function showLayer_aut() {
  init();
  if(NC) {
	  eval('document.layers["descr"].visibility = "visible"');
	  eval('document.layers["descr"].displayy = "block"');
	}
    if((Opera) || (IE)) {
	  eval('document.getElementById("descr").style.visibility = "visible"');
	  eval('document.getElementById("descr").style.display = "block"');
	} 
}