function get_cookie(name)
{
	var arr = document.cookie.split("; ");
	for(var i = 0;i < arr.length;i++){
		var temp = arr[i].split("=");
		if(temp[0] == name) return unescape(temp[1]);
	}
}

function set_cookie(name,value,expire_hours)
{
	var exp_date = new Date();
	exp_date.setHours(exp_date.getHours() + 8 + expire_hours);
	document.cookie = name + "=" +escape(value) + ((expire_hours == null) ? "" : ";expires=" + exp_date.toGMTString()); 
}