preloading images in a background table attribut tag

hi,
i know that the background attribut on table is not official but you can still use it and it will load an image as a background but i have an already coded site wich uses this background tag and a preload image js function wont work correctly, is there an solution to this?, right now i only see changing the code of the page(it's a damn nasty table based code)

looks like images cant get preloaded correctly if they are inside a td or table:the td structure gets loaded first then the image(wich is inside this non-official background tag: <td background="images/..." ...>)