var prefsLoaded = false;
var defaultFontSize = 75;
var currentFontSize = defaultFontSize;

function revertStyles()
{
	currentFontSize = defaultFontSize;
	changeFontSize(0);

}

function changeFontSize(sizeDifference)
{
	currentFontSize = parseInt(currentFontSize) + parseInt(sizeDifference * 5);

	if(currentFontSize > 125)
	{
		currentFontSize = 125;
	}
	else if(currentFontSize < 60)
	{
		currentFontSize = 60;
	}

	setFontSize(currentFontSize);
};

function setFontSize(fontSize)
{
	var stObj = (document.getElementById) ? document.getElementById('container') : document.all('container');
	document.body.style.fontSize = fontSize + '%';
};

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 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;
};

window.onload = setUserOptions;

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

		prefsLoaded = true;
	}

}

window.onunload = saveSettings;

function saveSettings()
{
	createCookie("fontSize", currentFontSize, 365);
}