This JavaScript code snippet allows you to direct viewers with no Cascading Style Sheets Support to be automatically redirected to a page without CSS or for alert announcement/notice. 

Insert this code into your HEAD of HTML

<!-- // == ######################## This Script Free To Use Providing This Notice Remains ######################## == // // == This Script Has Been Found In The http://www.DesignerWiz.com Javascript Public Archive Library == // // == NOTICE: Though This Material May Have Been In A Public Depository, Certain Author Copyright Restrictions May Apply == // --><script language="JavaScript" type="text/javascript"> <!-- Begin var csspage = "http://www.your-site.com/ccs-page.html"; var nocsspage = "http://www.your-site.com/no-ccs-page.html"; var vers = navigator.appVersion; vers = vers.substring(0,1); if (vers >= 4) window.location = csspage; else window.location = nocsspage; // End --> </script>

Simply Cut and Paste Script code
Be sure to properly place script position in head section of html 

This script has been in the DesignerWiz.com Public Library.