jQuery(document).ready(function () {
    jQuery('#at15s').live('mouseover', addThis_MouseOver);
    jQuery('#at15s').live('mouseout', addThis_MouseOut);
});

function addThis_MouseOver(event) {
    jQuery('.richardson-tab').addClass('hover');
}

function addThis_MouseOut(event) {
    jQuery('.richardson-tab').removeClass('hover');
}