What languages should Web Designers know?
For web design itself, a good knowledge of XHTML 1.0, HTML 4 and 5, and CSS 3 should be sufficient. Additionally, JavaScript is a great language to know for user interface design and functionality, though maintaining your knowledge of the first three languages is best, so you can design around JavaScript with degrading gracefully in mind.
If you are looking at web development, PHP or ASP are good languages to learn, as well as a database language, such as MySQL or SQL.
Other relevant languages can include Perl, Python, and Ruby (especially with Rails as a framework).
If you should decide to learn JavaScript, be sure to learn and master jQuery as well. It’s an easier way to use JavaScript and will provide many functions to you very easily.