function cs_nav_hover(id) {
  var navi = new Array("main", "clan", "com", "web");
  for (a=0; a < navi.length; a++) {
    if(id != navi[a]) { 
	  document.getElementById("sub_" + navi[a]).style.display = 'none';
	}
  }
  document.getElementById("sub_" + id).style.display = 'block';
}