rollover
$(function(){ $("img.rollover").mouseover(function(){ $(this).attr("src",$(this).attr("src").replace(/^(.+)(\.[a-z]+)$/, "$1_on$2")); }).mouseout(function(){ $(this).attr("src",$(this).attr("src").replace(/^(.+)_on(\.[a-z]+)$/, "$1$2")); }); });
<img class="rollover" src="img_example.jpg" />