jQuery(document).ready(function($) {
$('ul li:first-child').addClass('first-child');
$('ul li:last-child').addClass('last-child');
$('ul li:nth-child(even)').addClass('even');
$('ul li:nth-child(odd)').addClass('odd');
$('table tr:first-child').addClass('first-child');
$('table tr:last-child').addClass('last-child');
$('table tr:nth-child(even)').addClass('even');
$('table tr:nth-child(odd)').addClass('odd');
$('tr td:first-child').addClass('first-child');
$('tr td:last-child').addClass('last-child');
$('tr td:nth-child(even)').addClass('even');
$('tr td:nth-child(odd)').addClass('odd');
});
Or better yet:
jQuery(document).ready(function($) {
$('*:first-child').addClass('first-child');
$('*:last-child').addClass('last-child');
$('*:nth-child(even)').addClass('even');
$('*:nth-child(odd)').addClass('odd');
});