Sometimes whenever I try saving a image as a .dds file when the save pop-up comes up in Photoshop CS this is how it looks:
http://www.imagehosting.com/show.php/918609_dds.bmp.html
As you can see the save button can't be click on...

must admit I know zilch about the DDS format or it's save options, but what happens to the 'Save' button if you select a different radio button in the "Save Format" section of the dialogue box? Is "No Alpha (DXT1)" the option you want or simply the default?

The "save" button stays the same. But I've found out what was wrong. Apparently, the dimensions of image for X and Y both have to be multiples of 4.