The capturing of screen width and color depth is not required for the active collection of stats data for your site. If you would like to capture this addtional data, you will need to activate the javascript required for reading this data from the users screen. This is very simple!
<script language="javascript"> <!-- writeCookie(); function writeCookie() { var today = new Date(); var the_date = new Date("December 25, 2012"); var the_cookie_date = the_date.toGMTString(); var the_cookie = "sw=" + screen.width + "; expires=" + the_cookie_date + "; path=/" + "; domain="; document.cookie=the_cookie var today = new Date(); var the_date = new Date("December 25, 2012"); var the_cookie_date = the_date.toGMTString(); var the_cookie = "sc=" + screen.colorDepth + "; expires=" + the_cookie_date + "; path=/" + "; domain="; document.cookie=the_cookie } //--> </script>