This CSS code adds a background image.

.backimage { background-image:url(/images/imagefile.jpg);}

If you followed the instructions for How to Fix Problems in Internet Explorer that do not Happen in Other Browsers you could find the background image not working.

This is because the fix to IE requires that the url be in quotes, single or double quotes are fine. Change your CSS code to this. Notice the quotes around the file name.

.backimage { background-image:url('/images/imagefile.jpg');}