i have saved documents as templates by mistake. can anyone tell me how i can delete a template from my template chooser?
You don't delete from the template chooser. As with any file you delete them from Finder. Pages stores those you created & saved as templates in (your account) > Library > Application Support > iWork > Pages > Templates > My Templates. The user's Library is hidden in Lion & Mountain Lion but it is easy to open. In Finder, hold down the Option key while clicking on the Go menu & your user Library will appear about halfway down the list. Or you can choose Go to Folder from the Go menu in Finder & paste this line in the box:
~/Library/Application Support/iWork/Numbers/Templates/My Templates/