sizeNow = 100
inc = 10

function upSize()
{
  if (document.getElementById)
  {
	sizeNow = (parseInt(sizeNow) + inc) + "%"
	document.getElementsByTagName('BODY')[0].style.fontSize = sizeNow
  }
}

function downSize()
{
  if (document.getElementById)
  {
	sizeNow = (parseInt(sizeNow) - inc) + "%"
	document.getElementsByTagName('BODY')[0].style.fontSize = sizeNow
  }
}

function normSize()
{
  if (document.getElementById)
  {
	sizeNow = "100%"
	document.getElementsByTagName('BODY')[0].style.fontSize = sizeNow
  }
}