<body>
<a href="javascript
:void(0)" onclick="javascript
:document.body.style.background Image='url(
http://www.imagenestop.com/items/car...527.jpg)'; document.body.style.backgroundColor='none';"><img style="width: 40px; height: 40px;" src="http://www.imagenestop.com/items/carros-para-descargar-26527.jpg" /></a>
<a href="javascript
:void(0)" onclick="javascript
:document.body.style.background Image='url(
http://www.imagenestop.com/items/car...532.jpg)'; document.body.style.backgroundColor='none';"><img style="width: 40px; height: 40px;" src="http://www.imagenestop.com/items/carros-para-descargar-26532.jpg" /></a>
<a href="javascript
:void(0)" onclick="javascript
:document.body.style.background Image='url(
http://www.imagenestop.com/items/car...538.jpg)'; document.body.style.backgroundColor='none';"><img style="width: 40px; height: 40px;" src="http://www.imagenestop.com/items/carros-para-descargar-26538.jpg" /></a>
</body>
si te sirve el code sumame
aaja creo que funcionara
ya lo probe