This pages demonstrates a little plugin called 'hoverpulse' which grows and then restores an element's size in response to the mouse hovering over it.
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$(document).ready(function() {
$('div.thumb img').hoverpulse();
});
$(document).ready(function() {
$('div.thumb img').hoverpulse({
size: 40, // number of pixels to pulse element (in each direction)
speed: 400 // speed of the animation
});
});