$(document).ready(function(){
  /*// Reset Font Size
  var originalFontSize = $('#div_conteudo').css('font-size');
    $(".resetFont").click(function(){
    $('#div_conteudo').css('font-size', originalFontSize);
  });*/
  // Increase Font Size
  $(".increaseFont").click(function(){
    var currentFontSize = $('#div_principal #div_conteudo').css('font-size');
    var currentFontSizeNum = parseFloat(currentFontSize, 11);
    var newFontSize = currentFontSizeNum+1;
    $('#div_conteudo').css('font-size', newFontSize);
    return false;
  });
  // Decrease Font Size
  $(".decreaseFont").click(function(){
    var currentFontSize = $('#div_principal #div_conteudo').css('font-size');
    var currentFontSizeNum = parseFloat(currentFontSize, 11);
    var newFontSize = currentFontSizeNum-1;
    $('#div_conteudo').css('font-size', newFontSize);
    return false;
  });
});