$(function(){ 
    rainbow();  
    function rainbow(){
        $(".rainbow").animate({color:"red"},2500)
        .animate({color:"orange"},2500)
		.animate({color:"yellow"},2500)
        .animate({color:"#32cd32"},2500)
        .animate({color:"blue"},2500)
        .animate({color:"#9900dd"},2500);
        setInterval(rainbow,15000);
    }
})();