if (navigator.appVersion.match(/MSIE 6/i))
    document.write('<link type="text/css" rel="stylesheet" href="/static/styles/overrides/ie.css" />');

if (navigator.appVersion.match(/MSIE 7/i))
    document.write('<link type="text/css" rel="stylesheet" href="/static/styles/overrides/ie7.css" />');