Animation Events

<button id="slideAwayButton">Slide block away</button>
<button id="slideBackButton">Slide block back</button>

<div id="slideTarget" class="red-block slide">
	A red block
</div>
<script>
	dojo.require("dojo.fx");

	dojo.ready(function(){
		var slideAwayButton = dojo.byId("slideAwayButton"),
			slideBackButton = dojo.byId("slideBackButton"),
			slideTarget = dojo.byId("slideTarget");

		dojo.connect(slideAwayButton, "onclick", function(evt){
			var anim = dojo.fx.slideTo({
				node: slideTarget,
				left: "200",
				top: "200",
				beforeBegin: function(){
					dojo.style(slideTarget, {
						left: "0px",
						top: "100px"
					});
				}
			});

			dojo.connect(anim, "onEnd", function(){
				dojo.style(slideTarget, {
					backgroundColor: "blue"
				});
			});

			anim.play();
		});
		dojo.connect(slideBackButton, "onclick", function(evt){
			var anim = dojo.fx.slideTo({
				node: slideTarget,
				left: "0",
				top: "100",
				beforeBegin: function(){
					dojo.style(slideTarget, {
						left: "200px",
						top: "200px"
					});
				}
			});

			dojo.connect(anim, "onEnd", function(){
				dojo.style(slideTarget, {
					backgroundColor: "red"
				});
			});

			anim.play();
		});
	});
</script>