$(document).ready(function() {  
      
     spectrum();  
      
     function spectrum(){  
        var hue = 'rgb(' + (Math.floor(Math.random() * 220)) + ',' + (Math.floor(Math.random() * 256)) + ',' + (Math.floor(Math.random() * 256)) + ')';  
        $('#site-title').animate( { backgroundColor: hue }, 5000);  
        spectrum();  
     }  
      
    });