In Production Site is Not working Urgent please can any one give some idea

hi

i creted one vf and one class i migrated in production and i added that vf page to site

now everything is fine.

i given all permision set.

in my class and vf page i use only contact and account for this field i given all permision.

my probelm is

when i click on the site the page is opening but when i fill the details and clicking of submit the records are not creating and its not redirecting the page.

if go with apex/myvisualforcepage for this its working.

when i go through site its not working

Any one know about this plase help me

thanks

venkatesh.