[jQuery] animate() for background-image and/or classnames?

[MrNase]

Hi there!

Is there any chance to use animate() to animate a background-image and/
or classnames?

 $("#block").animate({
    backgroundImage: 'url(bla.gif)'
 }, 1500 );

Doesn't seem to work. :(

Let's say I have an element with a red background and the class 'red',
I want to remove the class 'red' and add the class 'blue' so that the
element get's blue.