The URLs for CSS files in Salesforce resemble this:
/sCSS/25.0/sprites/1344400715000/Theme3/default/gc/elements.css
What does the 1344400715000
refer to, and is there a way to expose that value via global variables? I know that I could find it retroactively with this javascript:
var reg = /\d{13}/;
var cssurl = document.getElementsByTagName('link')[0];
var mystery = cssurl.match(reg)[0]
But I'd love a way to find it proactively.