Скрипт определения браузера пользователя

$sBrowserClass = "";
if (preg_match("/Opera\W*(\d+(:?\.\d+)?)/",@$_SERVER["HTTP_USER_AGENT"], $aMatch)) {
$sBrowserClass = "isOpera";
if (@$aMatch[1] && $aMatch[1] < 9) {
$sBrowserClass .= " isOpera8";
}
}
elseif (preg_match("/MSIE\W*(\d+(:?\.\d+)?)/",@$_SERVER["HTTP_USER_AGENT"], $aMatch)) {
$sBrowserClass = "isIE";
if (@$aMatch[1] && $aMatch[1] < 7) {
$sBrowserClass .= " isIE6";
}
}
elseif (preg_match("/Chrome\W*(\d+(:?\.\d+)?)/",@$_SERVER["HTTP_USER_AGENT"], $aMatch)) {
$sBrowserClass = "isChrome";
if (@$aMatch[1] && $aMatch[1] < 7) {
$sBrowserClass .= " isChrome";
}
}
elseif (preg_match("/Mozilla\W*(\d+(:?\.\d+)?)/",@$_SERVER["HTTP_USER_AGENT"], $aMatch)) {
$sBrowserClass = "isMozilla";
if (@$aMatch[1] && $aMatch[1] < 7) {
$sBrowserClass .= " isMozilla";
}
}
elseif (preg_match("/Safari\W*(\d+(:?\.\d+)?)/",@$_SERVER["HTTP_USER_AGENT"], $aMatch)) {
$sBrowserClass = "isSafari";
if (@$aMatch[1] && $aMatch[1] < 7) {
$sBrowserClass .= " isSafari";
}
}
if ($sBrowserClass) {
$sBrowserClass = ' class="' . $sBrowserClass . '"';
}

<body<?php echo $sBrowserClass?>>