animate.js

// JavaScript Document
$(document).ready(function(){
    color = 'red';
    window.setInterval(function(){
        if(color == 'red'){
            $('div#testing').animate({'background-color': 'blue'}, 'fast', 'easeOutQuint');
            color = 'blue';
        }
        else if(color == 'blue'){
            $('div#testing').animate({'background-color': 'red'}, 'fast', 'easeOutQuint');
            color = 'red';
        }
        console.log(color);
    }, 5000);
});