function get_el(id) {
  if      (document.layers)         return document.layers[id];         // NC 4
  else if (document.all)            return document.all[id];            // IE 4
  else if (document.getElementById) return document.getElementById(id); // DOM
  else                              return null;        
}

function DropDownMenu(id) {
  var a=get_el('submen'+id);
  if (a==null) return;
  a.style.display='block';
}

function DropUpMenu(id) {
  var a=get_el('submen'+id);
  if (a==null) return;
  a.style.display='none';
}

function wo(url, width, height) {
  var a='www'+Math.round(Math.random()*1000000);
  var www = window.open(url, a, 'toolbar=1,location=1,menubar=1,status=1,scrollbars=1,left='+(screen.width/2-width/2)+',top='+(screen.height/2-height/2-100)+',width='+width+',height='+height);
  www.focus();
};