function getCookie(c_name)
{
	if (document.cookie.length > 0)
	{
		c_start = document.cookie.indexOf(c_name + "=")
		if (c_start != -1)
		{ 
			c_start = c_start + c_name.length + 1 
			c_end = document.cookie.indexOf(";",c_start)
			if (c_end == -1) c_end = document.cookie.length
			return unescape(document.cookie.substring(c_start,c_end))
		} 
	}
	return null
}

function setCookie(c_name,value,expiredays)
{
	var exdate = new Date()
	exdate.setDate(exdate.getDate() + expiredays)
	document.cookie = c_name + "=" + escape(value) + ";path=/" +
	((expiredays==null) ? "" : ";expires=" + exdate)
}