This will make the second function wait 2 seconds (2000 milliseconds) before executing:
$('.icon').hover(function() {
clearTimeout($(this).data('timeout'));
$('li.icon > ul').slideDown('fast');
}, function() {
var t = setTimeout(function() {
$('li.icon > ul').slideUp('fast');
}, 2000);
$(this).data('timeout', t);
});
It also clears the timeout when the user hovers back in to avoid crazy behavior.
This is not a very elegant way of doing this, however. You should probably check out the hoverIntent plugin, which is designed to solve this particular problem.
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