rollover=new Image(114,33);   // change the numbers on the left to match the size of the images
rollover.src="../images/button_contribute_header.png";    // change the name of the images (image1.gif, image2.gif...) to suit your needs
rollover.src="../images/button_contribute_header_hover.png";
rollover=new Image(134,38);   // change the numbers on the left to match the size of the images
rollover.src="../images/button_contribute.png";    // change the name of the images (image1.gif, image2.gif...) to suit your needs
rollover.src="../images/button_contribute_header.png";