css got number at the last url
- by every
<link href="/stylesheets/blueprint/screen.css?1268721265" media="screen, projection" rel="stylesheet" type="text/css" />
<link href="/stylesheets/blueprint/print.css?1268721265" media="print" rel="stylesheet" type="text/css" />
why the css got 1268721265 ?
any idea?thanks