[jQuery] How to check TD background image has been loaded.

Hi there,

I am trying to update the attr of background in <td>.  ==>>   <td id="mytd"
background="" height="100%" align="left" valign="top"></td>

is that possibly to use jQuery to check if the background image has been
loaded?

something like this..

$('#mytd background').load(function(){
alert('the background image has been loaded');
});

Thank you for you help!
-Ace