av = navigator.appVersion;

//teste para internet explorer 7 e outros browsers
if ((screen.width < "801") && (av.indexOf("MSIE 7") != -1 || parseFloat(av) > 4))
{
    document.write("<link rel='stylesheet' href='../util/css/800.css' type='text/css' />");
    document.write("<style>@import:url('../util/css/800.css')</style>");
}
// teste para internet explorer 6
else if (screen.width < "801" && av.indexOf("MSIE 6") != -1)
{
    document.write("<link rel='stylesheet' href='../util/css/ie6/800ie6.css' type='text/css' />");
    document.write("<style>@import:url('../util/css/ie6/800ie6.css')</style>");
}