"What I mean is that I get a lot of Jquery CSS errors/warnings in Firefox error console ,like if I visit this page"
Well, let's look at one: >From the Firefox error console: ---------------------------------------------------------------- Warning: Error in parsing value for 'cursor'. Declaration dropped. Source File: http://static.jquery.com/ui/css/base2.css Line: 865 ---------------------------------------------------------------- That line is: #widget-docs .option-header dd span:hover { border-bottom: 1px dashed #000; color: #999; cursor: pointer; cursor: hand; } So both "pointer" and "hand" are listed...... why? because according to quirksmode.org. IE 5.5 doesn't support "pointer" (http:// www.quirksmode.org/css/cursor.html).... so both are put into the CSS, any browser supporting "pointer", which is pretty much any browser newer than 6-7 years old at this point, just "drops" the style.... most of those warnings are because of IE-specific situations just like that..... if that's a deal breaker for your clients, they do not understand the internet and what it takes to create an application that works no matter what the browser... you could go through the CSS and remove every IE specific declaration, but now you'd have to support two copies of the file, one for IE, one for everyone else.....
