Yes, that is clearly what is needed. Unfortunately our Institute doesn't have a reasonable budget to accomplish something of this scope.
I read the links you sent on HTML and CSS. Very interesting. It clarified for me what we need to do. Seems like we need to rewrite everything for HTML5 (maybe not just HTML4) and use CSSs.
Rob suggested a CMS (content management system), which sounded interesting but I don't really understand how it works.