function IsEmail (s)
{
         if (s.length > 100)
         {
                alert("Email地址长度不能超过100位!");
                return false;
         }
         var regu = "^(([0-9a-zA-Z]+)|([0-9a-zA-Z]+[_.0-9a-zA-Z-]*[0-9a-zA-Z]+))@([a-zA-Z0-9-]+[.])+([a-zA-Z]{2}|net|com|gov|mil|org|edu|int)$"
         var re = new RegExp(regu);
         if (s.search(re) != -1)
               return true;
         else
               return false;
}