CSS code
var people=
{"userDetails":
[
{"sm_uid":"226","sm_user":"librashengsh","sm_uname":"ss","sm_tea_pic":"TeacBbsPic/20100422094813.jpg"},
{"sm_uid":"231","sm_user":"ssssss","sm_uname":"ss","sm_tea_pic":"TeacBbsPic/20100505135408.jpg"},
{"sm_uid":"295","sm_user":"yusuke","sm_uname":"ykl","sm_tea_pic":"images/upic.gif"},
{"sm_uid":"227","sm_user":"abcdefg","sm_uname":"abc","sm_tea_pic":"TeacBbsPic/20100422154044.jpg"}
]};
for (var i in people['userDetails']) {
if (people['userDetails'][i].sm_uid.indexOf('2') != -1) {
alert(people['userDetails'][i].sm_uid);
}
}