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About Iframe virus and removal procedure

There are different variants of badware/malware that infect websites. Some of them are called "gumblar" spyware. Typcially, they cause damage by injecting iframe tags into your website. Code may be injected in html, php or tpl source files. They may infect through various themes/templates of CMS(Content Management Systems) like Joomla or Drupal.
This is how so many websites are hacked and blacklisted.
This recent surge in compromised web servers has generated many interesting discussions in online forums and blogs.  Web malware infections hurt businesses Google, Firefox, IE, and anti-virus companies blacklist infected sites. Businesses lose thousands of dollars in revenue. Sites suffer damage to their brand and reputation.