function resizeText(multiplier) { 
  if (document.body.style.fontSize == "") { 
    document.body.style.fontSize = "1.0em"; 
  } 
  document.body.style.fontSize = parseFloat(document.body.style.fontSize) + (multiplier * 0.2) + "em"; 
}

//$("plustext").addEvent("click", function() {resizeText(1);}); 
//$("minustext").addEvent("click", function() {resizeText(-1);});