load diffrent css files?

how can i load diffrent css files for diffrent browsers? as my site images are in png as its transparant but i need i.e 5 and lower to see jpeg or gif image.

Thanks

 

I think it's done like this

<!--[if IE 5]>
<link type="text/css" rel="stylesheet" href="../style.css" />
<![endif]-->

Code (markup):

 

Thanks steve i'll try 2mo but add the code 2night