function getCookie(name){
var dcookie=document.cookie;
var cname=name+"=";
var clen=dcookie.length;
var cbegin=0;
while(cbegin<clen){
var vbegin=cbegin+cname.length;
if(dcookie.substring(cbegin,vbegin)==cname){
var vend=dcookie.indexOf(";",vbegin);
if(vend==-1)vend=clen;
return unescape(dcookie.substring(vbegin,vend));
}
cbegin=dcookie.indexOf(" ",cbegin)+1;
if(cbegin==0)break;
}
return null;
}
function setCookie(name,value,expires){
document.cookie=name+"="+escape(value)+
((expires)?"; expires="+expires.toGMTString():"");
}
function delCookie(name){
var tmp=getCookie(name);
if((tmp!='')&&(tmp!=null)&&(tmp!='null')){
var expireNow=new Date();
document.cookie=name+"="+"; expires=Thu, 01-Jan-70 00:00:01 GMT";
}
}