pulse jquery without a plugin

Question

I have a simple fade in that I would like to pulse in and out indefinitely. I have found plugins that do this but was curious if jquery already had a loop() api so I could just take care of it in the script.

<script type="text/javascript">
$(document).ready(function(){    
    $('.bottom-left').delay(1000).fadeIn(900);
    $('.bottom-right').delay(3000).fadeIn(700);
});
</script>