change Apayment logos

At the bottom of the page there is a paypal and two credit card logos. I need to remove the paypal logo and replace it with a worldpay one. I can't work out where or how to change it! Please can someone help?
Thanks

Version 1.4.8. default templete

Im guessing you mean the little logos at the bottom.

they are in footer.tpl you can find it in catalog/view/theme/default/template/common/footer.tpl