<!--
function MM_showHideLayers(l1,s1,l2,s2) {
  var obj, obj_style; 

  obj = document.getElementById(l1);
  obj_style = obj.style;
  obj_style.visibility = s1;
  
  obj = document.getElementById(l2);
  obj_style = obj.style;
  obj_style.visibility = s2;  
}
//-->