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