ahh ok, didnt know you were doing multisite.
Code:
<?php
// only admins will be allowed to post iframes or else it will strip them.
// have a peek at http://codex.wordpress.org/Roles_and_Capabilities
// set it to whatever level you want to be able to iframe
if ( !current_user_can('manage_options') ) {
function remove_iframe($content) {
$content = get_the_content();
$content = apply_filters('the_content', $content);
$pattern = '/(<iframe.+?>)/';
$content = preg_replace($pattern, '', $content);
return $content;
}
add_filter('the_content','remove_iframe');
}
probably something like this without a plugin.