function getCookie(name)
{
var offset,cookieValue;
var search=name+"=";
if(document.cookie.length>0)
{
offset=document.cookie.indexOf(search);
if(offset!=-1)
{
offset += search.length;
end = document.cookie.indexOf(";", offset);
if (end == -1)
end = document.cookie.length;
cookieValue=unescape(document.cookie.substring(offset, end));
}
}
return cookieValue;
}
//name表示cookie的键的名字