$email="abc@163.com";

setcookie("y_email",$email,time()+3600,"/");

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 "";

}

var y_email=getCookie('y_email');

setcookie("y_email","",time()-3600,"/");