IE6 is somehow still some users browser of choice, or are restricted by work computers that still run IE6.
This snippet will force IE6 users to view the default template leaving your design viewable by users with modern browsers only, thus saving time on IE6 bug fixing.
Simply paste the code below into your functions.php file.
add_filter('template', 'default_ie');
add_filter('option_template', 'default_ie');
add_filter('option_stylesheet', 'default_ie');
function default_ie($theme) {
if(strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE 6') !== false)
$theme = 'default';
return $theme;
}







This is very similar to http://www.nathanrice.net/blog/serve-ie6-visitors-the-default-wordpress-theme/ This one is simpler though.
Yeah, It is very similar to nathan’s snippet.