function displ(boxx) { 
if (document.getElementById(boxx).style.display == 'none') {
	document.getElementById(boxx).style.display = 'block'} 
else {document.getElementById(boxx).style.display = 'none'}
}

function showDv(n)
{ for(i=1; 4>i; i++)
{
document.getElementById('d'+i).style.display = 'none';
}
document.getElementById('d'+n).style.display = 'block';
}

function activate(a){
  var aa = document.getElementsByTagName('a');
  for( i in aa )
    if( aa[i] != a && aa[i].className == 'active' )
      aa[i].className = 'medium button red';
  a.className = 'active';
  }