How to achieve cyclic light and dark changes in images using javascript_javascript skills

The example in this article describes the method of implementing cyclic light and dark changes in images using JavaScript. Share it with everyone for your reference. The details are as follows:

<SCRIPT language=JavaScript>
var d=0
function JM_fade(ob){
if (d==0) {ob.filters.alpha.opacity+=1}
else {ob.filters.alpha.opacity-=1}
if (ob.filters.alpha.opacity==100){d=1;}
else if (ob.filters.alpha.opacity==0){d=0}
}
setInterval("JM_fade(u)",10)
</SCRIPT>
<center>
<IMG style="FILTER: alpha(opacity=0)" 
src="/images/banner.gif" name=u> 
</center>

I hope this article will be helpful to everyone’s JavaScript programming design.