TeamCityStatusBar.js

// ==UserScript==
// @name       Red Green Bar
// @namespace  http://use.i.E.your.homepage/
// @version    0.1
// @description  enter something useful
// @match      http://dev-cer-ci-dt2.stkildard.vic.ausregistry.com.au:8080/overview.html
// @copyright  2012+, You
// ==/UserScript==

setInterval(function() {
    var successful = jQuery("#ph_project1 td>span").filter(
        function() {return jQuery(this).css("background-image").indexOf("successfulSmallExpanded") > -1;}
    ).size() === 1;
    var color = successful ? 'lightgreen' : 'red';
	jQuery('#ph_project1').css('background', color);
}, 5000);