saving images which have been assigned a strange name

I have a problem . I have posted this earlier as well ,but no one seems to be able to help me but here i go again. I retrieve my images from a mysql db , but whenever i want to save the image it has been assigned a name identical to my php page (without the extension though) eg. If you click on a picture and the name of the webpage is oneimage.php the image will automatically have a save name = oneimage. i have tried to add a name tag to the image, but it doesn't seem to work. I thought there was an inbuild funtion which automatically kept control of the imagename, but i might be wrong ? Thanks Lars Eirik