function hideSingle(nodeid) {
  if (document.getElementById) {
     var node = document.getElementById(nodeid);

     if (node != null) {
        node.style.visibility = "hidden";
        node.style.display = "none";
     }
  }
}

function hideAll() {
   var words = new Array("tide", "surfschool", "surfshop", "surfspot", "webcam", "configuration");
   
   for (var i = 0; i < words.length; i++) {
      hideSingle(words[i]);
   }
}

function toggle(obj) {
    if (document.getElementById) {
        var el = document.getElementById(obj);

        if (el != null) {
            el.style.display = (el.style.display != 'none' ? 'none' : '' );
            el.style.visibility = (el.style.visibility != 'visible' ? 'visible' : 'hidden' );
        }


    }
}