function reveal(i)
{
 if (document.getElementById)
 {
  var b=document.getElementById(i);
  var s=b.style && b.style.display!="block";
  unselect("div");
  if (i.substring(0,1)=="m")
  {
   hide("mBlock");
   unselect("h1");
   if (s) document.getElementById("h"+i).className+=" selected";
  }
  else if (s) document.getElementById("b"+i).className+=" selected";
  hide("fBlock");
  b.style.display = s?'block':'hidden';
 }
}

function hide(c)
{
 var alltags=document.getElementsByTagName("div")
 for (i=0; i<alltags.length; i++)
 {
  if (alltags[i].className==c) alltags[i].style.display = 'none';
 }
}

function unselect(t)
{
 var alltags=document.getElementsByTagName(t)
 for (i=0; i<alltags.length; i++)
 {
  if (alltags[i].className.search("selected")!=-1)
   alltags[i].className = alltags[i].className.replace("selected","");
 }
}