accessibility_buttons = ["accessibility_small", "accessibility_medium", "accessibility_large"]

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 checkSessionFontSize() {
    var size = readCookie("sessionFontSize");    
	if(size!=null)
		changeFontSize();
	else
		document.getElementById(accessibility_buttons[0]).className = "active";
}

function changeFontSize(size) {
    if (size != readCookie("sessionFontSize") || size == null) {

        var fontSize = "small";
	    if (size == null) {
	        size = readCookie("sessionFontSize");
	        if (size == null)
	            size = "small";
	    }				
		switch(size)
		{			
			case "medium":
				fontSize = "large";
				break;
			case "large":
			    fontSize = "x-large";			
		}
		document.body.style.fontSize=fontSize;
		
		for(var i=0;i<accessibility_buttons.length;i++){
			if(accessibility_buttons[i] != "accessibility_" + size)
			    document.getElementById(accessibility_buttons[i]).className = "";
			else
			    document.getElementById(accessibility_buttons[i]).className = "active";
		}
		
		createCookie("sessionFontSize", size, 14);
		return fontSize;
	}
}

$(document).ready(function() {
    checkSessionFontSize();
});