pagination problem for serching from dB

i can lsit all user in my db using following script. But when i use it to search from db it can find but when i click thesecond page it gives error

1- first of all i open main page to search any term like in pic
http://divran.com/script/upload/images/1.gif

2- as you see in pic it can find more than one record
http://divran.com/script/upload/images/2.gif

3-when i clicked any page number it can not page it . why ?
http://divran.com/script/upload/images/3.gif

my script in attachment.