var prefsLoaded = false;
var defaultFontSize = 100;
var maxFontSize = 130;
var minFontSize = 70;
var currentFontSize = defaultFontSize;

function changeFontSize(sizeDifference){
	if ( sizeDifference == 0 )
		currentFontSize = defaultFontSize;
	else
		currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference * 5);

	if(currentFontSize > maxFontSize){
		currentFontSize = maxFontSize;
	}else if(currentFontSize < minFontSize){
		currentFontSize = minFontSize;
	}
	setFontSize(currentFontSize);
};

function setFontSize(fontSize){
	saveSettings();
	try
	{
		parent.document.getElementById('loading').contentWindow.document.body.style.fontSize = fontSize+'%';
	}
	catch(e) {}
};

function createCookie(name,value) {
    var date = new Date();
    date.setTime(date.getTime()+(365*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
	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;
};

window.onload = setUserOptions;

function setUserOptions()
{
	if(!prefsLoaded)
	{
		var cookie = readCookie("fontSize");
		currentFontSize = cookie ? cookie : defaultFontSize;
		setFontSize(currentFontSize);
		
		prefsLoaded = true;
	}
}

//window.onunload = saveSettings;

function saveSettings()
{
	createCookie("fontSize", currentFontSize);
}