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 "";
}

function setCookie(c_name, value, expiredays) {
	var deltaDays;
	var exdate;
	
	deltaDays = (expiredays == null) ? 0 : expiredays;
	exdate = new Date();

	exdate.setDate(exdate.getDate() + deltaDays);
	document.cookie = c_name + "=" + escape(value) +
		((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());
}

function clearCookie(c_name) {

	setCookie(c_name, "", -1);
}