Add browser classes to the BODY of a WordPress site. Not necessary if you're already using Modernizr or another solution.

WPbodyclass_browserID.php

<?php
	add_filter('body_class','browser_body_class');
	function browser_body_class($classes) {
    global $is_lynx, $is_gecko, $is_IE, $is_opera, $is_NS4, $is_safari, $is_chrome, $is_iphone;
		if($is_lynx) $classes[] = 'lynx';
		elseif($is_gecko) $classes[] = 'gecko';
		elseif($is_opera) $classes[] = 'opera';
		elseif($is_NS4) $classes[] = 'ns4';
		elseif($is_safari) $classes[] = 'safari';
		elseif($is_chrome) $classes[] = 'chrome';
		elseif($is_IE) $classes[] = 'ie';
		else $classes[] = 'unknown';
		if($is_iphone) $classes[] = 'iphone';
		return $classes;
	}
?>