function getcookie(name)...{ 
    var value = document.cookie; 
      var arr1 = value.split(;); 
    for(i=0;i<arr1.length;i++)...{
if(value.length == 0)...{
break;
}
sname = arr1[i].split("=")[0];
if(sname==name)...{
return arr1[i].split("=")[1];
}
}
return null;
}
/**//*****************************************
设置cookie的内容
*******************************************/
function setcookie(sname,svalue)...{//建立cookie
//有点类似与匿名类哦
var expires = function()...{//cookie失效时间为从建立起48小时一内
var mydate = new date();
mydate.settime(mydate.gettime + 48*60*60*1000);
return mydate.togmtstring();
}
if(sname.length!=0 && svalue.length!=0)...{
document.cookie = sname + "=" + svalue + ";expires=" + expires;
}else...{
alert("您的填写有空！");
}
}
/**//*****************************************
删除cookie
*******************************************/
function delcookie(sname,svalue)...{//删除一个指定的cookie键值对
document.cookie = sname + "=" + escape(svalue) + ";expires=fri, 31 dec 1999 23:59:59 gmt;";
}
/**//*****************************************
删除cookie
*******************************************/
function delcookie(sname)...{
var svalue=getcookie(sname);
if(svalue!=null)...{
document.cookie = sname + "=" + escape(svalue) + ";expires=fri, 31 dec 1999 23:59:59 gmt;";
}
}
/**//*****************************************
清空cookie
*******************************************/
function clearcookie()...{
var value = document.cookie;
var arr1 = value.split(";");
for(i=arr1.length-1;i>=0;i--)...{ 
        if(value.length == 0)...{ 
          break; 
        } 
        sname = arr1[i].split(=)[0]; 
        svalue = arr1[i].split(=)[1] 
        document.cookie = sname + = + escape(svalue) + ;expires=fri, 31 dec 1999 23:59:59 gmt;; 
  } 
}