THtmlViewer component
procedure ReplaceImage(Const NameID: String; NewImage: TStream);
ReplaceImage will replace an existing image in the displayed document with a new image.
NameIdThe Name or ID attribute assigned in the relevant <img> tag.
NewImageThe new image in stream form. The image format (bmp, gif, etc.) may be in any format currently supported by THtmlViewer.
Usage Notes:
The replaced image will have the same position and size as the original image.
The NewImage stream is not freed by ReplaceImage. It may be freed imediately after the call.