function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else var expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

function eraseCookie(name) {
  createCookie(name,"",-1);
}

function setBodyFontSize(size, height) {
  $("body").css({
      "font-size": size + "px",
	"line-height": height + "px"
	});
  
  return false;
}

$(document).ready(function() {
    if ( readCookie("fontSize") )
      setBodyFontSize(readCookie("fontSize"), readCookie("lineHeight"));

    $(".bodyFont").click(function() {
	var size = parseInt($("body").css("font-size"));
	var newSize = 0;
	var height = parseInt($("body").css("line-height"));
	var newHeight = 0;
	var increment = 3;
	
	
	if( $(this).hasClass("increase") ) {
	  newSize = size + increment;
	  newHeight = height + increment;
	}
	else if( $(this).hasClass("decrease") ) {
	  newSize = size - increment;
	  newHeight = height - increment;
	}
	
	setBodyFontSize(newSize, newHeight);
	
	createCookie("fontSize", newSize, 7);
	createCookie("lineHeight", newHeight, 7);
	
	return false;
      });

  });