منتدى استراحات زايد - help me problem in database vBulletin 3.8.5

i have a problem in database
this is the error message

PHP Code:
Database error in vBulletin 3.8.5:

Invalid SQL:

SELECT COUNT(*) AS threads, SUM(IF(thread.lastpost > 1273425725 AND open 10, 1, 0)) AS newthread

FROM thread AS thread

WHERE forumid = 80
AND sticky = 0

AND visible IN (0,1,2);

MySQL Error : Table './dhehibac_vb/thread' is marked as crashed and last (automatic?) repair failed
Error Number : 144
Request Date : Sunday, May 9th 2010 @ 07:01:00 PM
Error Date : Sunday, May 9th 2010 @ 07:01:00 PM
Script : http://www.dhehiba.com/forumdisplay.php?f=80
Referrer : http://www.dhehiba.com/
IP Address : 41.225.127.146
Username : ismail
Classname : vB_Database
MySQL Version : 5.0.90-community

when i made repair table i was the error message

PHP Code:
dhehibac_vbthread
error : 13 when fixing table
Error : Can't create/write to file '/tmp/STXH2V8D (Errcode: 13)
status : Operation failed

PHP Code:
dhehibac_vb.post
error : 13 when fixing table
Error : Can't create/write to file '/tmp/STi73e40 (Errcode: 13)
status : Operation failed

PHP Code:
thread Check Warning: Table is marked as crashed and last repair failed
thread Check Warning: Size of indexfile is: 1094656 Should be: 1038336
thread Check Warning: Size of datafile is: 772108 Should be: 771328
thread Check Error: Keypointers and record positions doesnt match
thread Check Warning: Found 7166 parts Should be: 7117 parts
thread Check Error: Corrupt

PHP Code:
post Check Warning: Table is marked as crashed and last repair failed
post Check Warning: Size of indexfile is: 18227200 Should be: 539648
post Check Warning: Size of datafile is: 22656564 Should be: 22656480
post Check Error: Found 15326 keys of 2302
post Check Error: Corrupt