example

/**
 * Half size
 */
t3.onclick = (function() {
    this.className = (this.swap++ % 2) ? 'baddie half-size' : 'baddie';
});

/**
 * Double size
 */
t4.onclick = function() {
    this.className = (this.swap++ % 2) ? 'baddie double-size' : 'baddie';
    console.log(this.swap);
};