var font_sizes = new Array(0.75, 0.85, 0.95, 1.05);
//var font_sizes = new Array(0.1, 0.2, 0.3);
var current_font_level = 0;
var decrease_font_level = 0;
var increase_font_level = 0;

function setFontSizeLevels()
{
	if (readCookie('font_size') == null) {
		increase_font_level = 1;
	}
	else {
		current_font_level = parseInt(readCookie('font_size'));
		increase_font_level = current_font_level + 1;
		decrease_font_level = current_font_level - 1;
	
		if (increase_font_level >= font_sizes.length)
			increase_font_level = font_sizes.length - 1;
		if (decrease_font_level < 0)
			decrease_font_level = 0;
	}
}

function loadFontSize ()
{
	if (readCookie('font_size') == null) {
		current_font_level = 0;
	} else {
		current_font_level = parseInt(readCookie('font_size'));
	}	
	setFontSize (current_font_level);
}

function setFontSize( size )
{
	if( size >= 0 && size < font_sizes.length )
	{
		current_font_level = size;
	}
	else if( ++current_font_level >= font_sizes.length )
	{
		current_font_level = 0;
	}
	
	if ( document.body )
	{
		document.body.style.fontSize = font_sizes[ current_font_level ] + 'em';
		createCookie("font_size", current_font_level, "30");
		setFontSizeLevels();
	}

}

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);
}

loadFontSize();