PLEASE HELEP !!!

Hello,
i want to filter some posts at my blog :

– most readed posts during 24 hours
– most readed posts during last week

i am using a theme, and i have tried some codes but idk if they works, here are the code :

// most readed during 24 hours
function tj_tabs_popular( $posts = 5, $size = 35 ) {
$popular = new WP_Query(“caller_get_posts=1&TIMEDIFF(NOW(), post_date) < 24&orderby=comment_count&posts_per_page=’.$posts”);
while ($popular->have_posts()) : $popular->the_post();

// weekly most readed.
function tj_tabs_weeklypopular( $posts = 5, $size = 35 ) {
$popular = new WP_Query(‘caller_get_posts=1&range=weekly&orderby=comment_count&posts_per_page=’.$posts);
while ($popular->have_posts()) : $popular->the_post();

PLASE HELP