function changetoDefault() {
	document.body.className = "";
	location.reload(true);
}

function changetoMedium() {
	document.body.className = "fontLarge";
}

function changetoLarge() {
	document.body.className = "fontLarger";
}

function num(e) 
{
    var k;
    document.all ? k = e.keyCode : k = e.which;
    return ((k > 47 && k < 58) || k == 46);
} 

function iotbs() {
	switcher = new switchManager();
};

var switcher;

//setup initialisation function
//.. gecko, safari, konqueror and generic
if(typeof window.addEventListener != 'undefined') {
	window.addEventListener('load', iotbs, false);
}
//.. opera 7
else if(typeof document.addEventListener != 'undefined') {
	document.addEventListener('load', iotbs, false);
}
//.. win/ie
else if(typeof window.attachEvent != 'undefined') {
	window.attachEvent('onload', iotbs);
}


//preferences manager
function switchManager() {
	//string for storing the overall custom classname
	//I was originally storing it in the body class name directly
	//but 1.7+ mozilla builds were not honouring the trailing whitespace we need
	this.string  = '';

	//store reference to body element
	this.body = document.getElementsByTagName('body')[0];

	//store the initial classname
	this.initial = this.body.className;

	//if the default classname is empty, add "iotbs"
	//because we need there to be at least one classname already -
	//the leading and trailing space in each custom classname is required,
	//but you can't set the body classname as " something" (beginning with a leading space)
	//because that may not work in Opera 7
	if(this.initial == '') {
		this.initial = 'itobs';
	}

	//look for a stored cookie
	this.cookie = this.read();

	//if it exists
	if(this.cookie != null) {
		//store cookie value to string
		this.string = this.cookie;

		//set new body class name
		this.body.className = this.initial + ' ' + this.string;
	}

	//*** dev
	//document.title = '<' + this.body.className.replace(/ /g,'+') + '>   [' + this.string.replace(/ /g,'+') + ']';
};

//set a cookie method
switchManager.prototype.set = function(days) {
	//format expiry date
	this.date = new Date();
	this.date.setTime(this.date.getTime() + ( days *24*60*60*1000));

	//store the string, replacing spaces with '#' so that leading spaces are preserved
	this.info = this.string.replace(/ /g,'#');

	//if the value is empty, set its expiry in the past to delete the cookie
	if(this.info == '') { this.date.setTime(0); }

	//create the cookie
	document.cookie = 'bodySwitcher=' + this.info
		+ '; expires=' + this.date.toGMTString()
		+ '; path=/';
};


//read a cookie method
switchManager.prototype.read = function() {
	//set null reference so we always have something to return
	this.cookie = null;

	//if a cookie exists
	if(document.cookie) {
		//if it's our cookie
		if(document.cookie.indexOf('bodySwitcher')!=-1) {
			//extract and store relevant information (turning '#' back into spaces)
			this.cookie = document.cookie.split('bodySwitcher=');
			this.cookie = this.cookie[1].split(';');
			this.cookie = this.cookie[0].replace(/#/g,' ');
		}
	}
	return this.cookie;
};


function changetoDefault() {
	switcher.string = 'default'
	switcher.body.className = " iotbs  ";
	switcher.set(365);
}

function changetoMedium() {
	switcher.string = 'medium';
	switcher.body.className = " iotbs  " + switcher.string +' ';
	switcher.set(365);
}

function changetoLarge() {
	switcher.string = 'large';
	switcher.body.className = " iotbs  " + switcher.string +' ';
	switcher.set(365);
}