How to check if we are on current tab

[Ayanize]

My theme option page is with tabs. How I can check if I am on current tab so that I can echo some information. I tried with this

function show_message(){

if( isset( $_GET['tab'] ) && $_GET['tab'] == 'tab_2' ){
echo 'This message';
else{
echo 'That Message';
}
}
add_action('admin_head','show_message');

But no luck. Again tried with this

global $pagenow;
if (( $pagenow == 'admin.php' ) && $page == 'theme_options' && ($_GET['tab'] == 'tab_2')) {

Still no luck.

Thanks in advance

[Author]

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