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)
{
//	alert("expiredays="+expiredays);
	var exdate=new Date()
	exdate.setDate(exdate.getDate()+expiredays)
	document.cookie=c_name + "=" +escape(value) + ((expiredays==null) ? "" : ";expires="+exdate.toGMTString())//why not +=???
//	document.cookie=c_name + "=" +escape(value)
}

function eraseCookie(name)
{
	setCookie(name,"",-1);//date=one day ago.
}