hi i have java script document in /js/test.js

when i try to access that file i am getting error www.domain.com/js/test.js

500 Internal Server Error
nginx/0.8.53


error log showing me this

2011/02/06 15:12:44 [error] 11249#0: *704 rewrite or internal redirection cycle while processing "/lightbox$
2011/02/06 15:13:33 [error] 11245#0: *791 rewrite or internal redirection cycle while processing "/lightbox$
2011/02/06 15:16:43 [error] 11245#0: *1165 rewrite or internal redirection cycle while processing "/lightbo$
2011/02/06 15:17:58 [error] 11239#0: *1321 rewrite or internal redirection cycle while processing "/lightbo$
2011/02/06 15:19:00 [error] 11240#0: *1402 rewrite or internal redirection cycle while processing "/lightbo$
2011/02/06 15:19:23 [error] 11240#0: *1452 rewrite or internal redirection cycle while processing "/lightbo$
2011/02/06 15:19:27 [error] 11247#0: *1473 rewrite or internal redirection cycle while processing "/lightbo$
2011/02/06 15:19:54 [error] 11247#0: *1558 rewrite or internal redirection cycle while processing "/lightbo$
2011/02/06 15:20:02 [error] 11247#0: *1585 rewrite or internal redirection cycle while processing "/lightbo$
2011/02/06 15:20:15 [error] 11242#0: *1640 rewrite or internal redirection cycle while processing "/lightbo$
2011/02/06 15:20:17 [error] 11242#0: *1652 rewrite or internal redirection cycle while processing "/lightbo$
2011/02/06 15:20:22 [error] 11242#0: *1677 rewrite or internal redirection cycle while processing "/lightbo$


how can i get rid of this problem i also give 755 js directory