please help. svere spamming is appearing in the footer region of my moodle site. when i examined the spam links, it appears to com from the web site http://elefants.cvut.cz/moodle/ how can i remove it?
That site you refer seems to be clean - most likely those links that you see in source of your site come from your own site and injected scripts in config.php of your moodle or some other php files (often index.php).
Read for example http://docs.moodle.org/en/Hacked_site_recovery for some actions you can take to clean your site and particularly config.php - and how to prevent such attacks in the future.