Create a loop in jquery

Create a loop in jquery

Hello. I have several elements that I can perform show hide and fadeIn animations on but I want the action to continue on an endless loop. Is this possible? If it is, are there any cpu usage issues when using a loop?

Thanks in advance
   
<script type="text/javascript">
$(document).ready(function(){
$(".upright").hide(300);
$(".cntrlg").show(300);
$(".cntrlg").hide(300);
$(".cntrmed").show(500);
$(".cntrmed").hide(300);
$(".cntrlg, .lowleftmed").show(100);
$(".cntrlg, .lowleftmed").hide(100);
$(".lowrightmed").show(300);
$(".lowrightmed").hide(300);
$(".cntrmed").show(300);
$(".cntrmed").hide(300);
$(".upright").show(2000);
$("#dai1").fadeIn(3000);
$("#dai2").fadeIn(3000);
$("#dai3").fadeIn(3000);
$("#june1").fadeIn(3000);
$("#june2").fadeIn(3000);
$("#june3").fadeIn(3000);
});
</script>