//设定cookie值
function setCookie(name, value, domain) {
 document.cookie = "[" + name + "]=" + escape(value) +";path=/"+ ((domain)?";domain="+domain:"") // + ((expire == null) ? "" : ("; expires=" + expire.toGMTString())) +";secure"
}//:$

//读取cookie值
function getCookie(Name) {
          var search = "[" + Name + "]="
          if (document.cookie.length > 0) { // if there are any cookies
                    offset = document.cookie.indexOf(search) 
                    if (offset != -1) { // if cookie exists 
                              offset += search.length 
                              // set index of beginning of value
                              end = document.cookie.indexOf(";", offset) 
                              // set index of end of cookie value
                              if (end == -1) 
                                        end = document.cookie.length
                              return unescape(document.cookie.substring(offset, end))
                    } 
          }
}//:$

//删除cookie值
function deleteCookie(name,path,domain){
 if(getCookie(name)) document.cookie = "["+ name +"]="+ ((path)?";path="+path:"") + ((domain)?";domain="+domain:"") //+";expires=Thu,01-Jan-70 00:00:01 GMT"
}