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Bạn copy code này rồi dán vào wap.Nhớ sửa nội dung đấy.

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 ""
}

function setCookie(c_name,value,expiredays)
{
var exdate=new Date()
exdate.setDate(exdate.getDate() expiredays)
document.cookie=c_name  "="  escape(value) 
((expiredays==null) ? "" : "; expires=" exdate.toGMTString())
}

function checkCookie()
{
username=getCookie('username')
if (username!=null && username!="")
{document.write('Chào ' username ',')}
else
{
username=prompt('Tên bạn là :',"")
document.write('Chào bạn ' username ', đừng quên để lại tin nhắn ở trang DIỄN ĐÀN nhé...!')
if (username!=null && username!="")
{
setCookie('username',username,365)
}
}
}
</script>