JPEG/TIF to dxf ??

I have added on a Wacom drawing tablet to my computer to docustom work for our customers. I need a program that will convertJpeg or Tif files into a 2d dxf format. I can then import theseinto SolidWorks. I need to know if anybody has used one of theseprograms, and where to purchase this item.SolidworksImport export