jQuery addClass example
Change class name on click in jQuery
by Dmitri Ganenco
HTML
<div id="loader">
<table height='100%' width='100%' style='cursor:wait'>
<tr>
<td style='vertical-align: middle' align='center'>
<img alt='' src='/_imgs/AdvFind/progress.gif' height="25px" />
<div /><span style='font-family:Tahoma,Arial;font-size: 11px;'>asd</span>
</td>
</tr>
</table>
</div>
<button type='button' id='btnLoadData'>
Load smth
</button>
JavaScript
$('#btnLoadData').on('click', function() {
$('.loader').show();
setTimeout(function() {
$('.loader').hide();
}, 2000);
});