1. A method of determining content type of contents of a subject Web page, comprising the steps of: providing a predefined set of potential content types; for each potential content type, running tests having test results which enable quantitative evaluation of at least some contents of the subject Web page being of the potential content type; mathematically combining the test results; and based on the combined test results, assigning a respective probability, for each potential content type, that some contents of that type exists on the subject Web page.