function setCookie(key, value, day) {
	day = parseInt(day);
	if(!isNaN(day)){
		var expireDate = new Date();
		expireDate.setTime(expireDate.getTime() + (day*24*3600000));
		document.cookie = key + "=" + value + ";expires=" + expireDate.toGMTString();
	}
	else{document.cookie = key + "=" + value;}
}
function getCookie(str){
	var reg = new RegExp("(^| )"+str+"=([^;]*)(;|$)","gi");
	var ck = reg.exec(document.cookie);
	try{if(ck[2] == null || typeof(ck[2]) == "undefined") return null;}
	catch(e){return null;}
	return ck[2];
}