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 setType()
{
	var cookie_no = parseInt(readCookie('randomType'));
	var rand_no = parseInt((Math.floor(Math.random()*3)) + 1);
	if (cookie_no == rand_no)
	{
		var rand_mod = parseInt((Math.floor(Math.random()*2)) + 1);
		if (rand_mod == 1)
		{
			rand_no = parseInt(rand_no + 1);
			if (rand_no > 3)
			{
				rand_no = 1;
			}
		}
		else
		{
			rand_no = parseInt(rand_no - 1);
			if (rand_no < 1)
			{
				rand_no = 3;
			}			
		}
	}
	document.getElementById('left-column-top').className = 'type-' + rand_no;
	createCookie('randomType',rand_no,7);
}