function colorSwitch(colorname) {

	document.documentElement.className = document.documentElement.className.replace(/blue|green/g, "");

	var d = new Date();
	document.cookie = "blue=; expires=" + d.toUTCString();
	document.cookie = "green=; expires=" + d.toUTCString();

	if(colorname != "pink"){
		document.documentElement.className += " " + colorname;
		document.cookie = colorname + "=1; expires=Thu, 02 Jan 2031 00:00:01 UTC;";
	}

}