There are some differences in Cascading Style Sheet implementation in Internet Explorer 3 and 4. So you may want to choose which set of style sheets to load for your web page depending on the user’s browser. This way, you can take advantage of some new attributes that are supported by IE 4 but not IE 3.
Use a browser version detection to determine which style sheet to load. For example,
Be sure to place the script in thesection of your HTML document.