web pages

can anyone tell me why when im downloading a web page, before the thumbnails open, i get a square with a red dot top left corner, a green circle at the right hand side, and a blue triangle at the bottom left hand corner?

  Diodorus Siculus 08:27 28 May 04

Do these disappear when the pics appear? If so, it is a standard means whereby some browsers show the type of file that is due to appear there.

thank you

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