Using prototype-ui (window and carousel) In IE6 a have noticed that a rule like:

#container { url(/img/bg_top_container.png) no-repeat; }

cause a double request on the server for the background image, a good request falowed by a bad one:

127.0.0.1 - - [06/Oct/2008:15:38:22 +0300] "GET /img/bg_top_container.png HTTP/1.1" 200 635

127.0.0.1 - - [06/Oct/2008:15:38:25 +0300] "GET /css//img/bg_top_container.png HTTP/1.1" 404 227

Folowing the track it apears that “fixRule” function doesn’t handle absolute urls right

   // Relative path
    if (src[r0] != '/')
        src = docPath + "/" + src;

the test should be

if (src.substr(0, 1) != '/')

in IE6

var x = '/img/bg_top_container.png';
var a = x.substr(0, 1) // returns /
var b = x[r0]; returns undefined;
alert(x.substr(0,1) + ' ' + x[r0]);