Easy way to show on scroll

qd-hreshold-scroll.js

var myDiv = dojo.byId("myID"), 
    thresh = 230; 

dojo.style(myDiv,{ opacity: 0, display:"none" }); 

dojo.connect(window,"onscroll",function(e) { 
	var scroll = -dojo.position(dojo.body()).y; 
	dojo.style(myDiv, { opacity: (Math.min(Math.max(0, scroll - thresh) / thresh, 1)), display:"inline" }); 
});