var minFontSize=8;
var maxFontSize=18;

$(document).ready(function(){
  // Reset Font Size
  var originalFontSize = $('div.fonttoggle').css('font-size');
    $(".resetFont").click(function(){
    $('div.fonttoggle').css('font-size', originalFontSize);
    $('a.decreaseFont').removeClass('decreasegrayout');
    $('img#decreaseFont').attr("src","images/fontsizedown.png");
    $('a.increaseFont').removeClass('increasegrayout');
    $('img#increaseFont').attr("src","images/fontsizeup.png");
    $('a.resetFont').addClass('resetgrayout');
    $('img#resetFont').attr("src","images/fontsizereset.gray.png");
  });
  // Increase Font Size
  $(".increaseFont").click(function(){
    var currentFontSize = $('div.fonttoggle').css('font-size');
    var currentFontSizeNum = parseFloat(currentFontSize, 10);
    var newFontSize = currentFontSizeNum+1;
    if (newFontSize <= maxFontSize) {
      $('div.fonttoggle').css('font-size', newFontSize);
    }
    if (newFontSize == maxFontSize) {
      $('a.increaseFont').addClass('increasegrayout');
      $('img#increaseFont').attr("src","images/fontsizeup.gray.png");
    }
    if (newFontSize > minFontSize) {
      $('a.decreaseFont').removeClass('decreasegrayout');
      $('img#decreaseFont').attr("src","images/fontsizedown.png");
    }
    if (newFontSize == originalFontSize) {
      $('a.resetFont').addClass('resetgrayout');
      $('img#resetFont').attr("src","images/fontsizereset.gray.png");
    }
    if (newFontSize != originalFontSize) {
      $('a.resetFont').removeClass('resetgrayout');
      $('img#resetFont').attr("src","images/fontsizereset.png");
    }
    return false;
  });
  // Decrease Font Size
  $(".decreaseFont").click(function(){
    var currentFontSize = $('div.fonttoggle').css('font-size');
    var currentFontSizeNum = parseFloat(currentFontSize, 10);
    var newFontSize = currentFontSizeNum-1;
    if (newFontSize >= minFontSize) {
      $('div.fonttoggle').css('font-size', newFontSize);
    }
    if (newFontSize == minFontSize) {
      $('a.decreaseFont').addClass('decreasegrayout');
      $('img#decreaseFont').attr("src","images/fontsizedown.gray.png");
    }
    if (newFontSize < maxFontSize) {
      $('a.increaseFont').removeClass('increasegrayout');
      $('img#increaseFont').attr("src","images/fontsizeup.png");
    }
    if (newFontSize == originalFontSize) {
      $('a.resetFont').addClass('resetgrayout');
      $('img#resetFont').attr("src","images/fontsizereset.gray.png");
    }
    if (newFontSize != originalFontSize) {
      $('a.resetFont').removeClass('resetgrayout');
      $('img#resetFont').attr("src","images/fontsizereset.png");
    }
    return false;
  });
});