Toggle display of DIV in IE and Mozilla

The following code will toggle the display (show/hide) of a division in both IE 5.5+ and Mozilla Firefox and can be used for menus, TOC’s etc. This is simple, but useful. If your looking for a really good collection of cross browser Javascript functions for manipulating HTML and the DOM then check out prototype and if you want a really good overview of the Javascript language, along with some good stories and history of the language, you must see these videos from Dougles Crockford .

function td(d)
{
   if(document.getElementById) {
      var o = document.getElementById(d) ;
      if((o.style.display == "block") || (o.style.display == ""))
         o.style.display = "none" ;
      else
         o.style.display = "block" ;
   }
}