var g_isIE = false, g_iMaj = 0;
g_sUA = window.navigator.appVersion;

if (parseInt(g_sUA.indexOf("MSIE ")) >= 0) // Check if IE
{
        g_isIE = true;
        g_iMaj = parseInt(g_sUA.substring(g_sUA.indexOf("MSIE ")+5,g_sUA.indexOf (".",g_sUA.indexOf("MSIE "))));
}
if ( (g_isIE) && (g_iMaj >= 4)) // For MSIE 4.0 or later
    document.write('<LINK REL="stylesheet" HREF="http.css" TYPE="text/css">');