Nevermind, solved it using HTML like this:

<object data="Race_Vulcan.png" class="basic_image">
<img src="Race_Vulcan.jpg" class="basic_image">
</object>

On Sat, Mar 5, 2016 at 9:57 PM, David Allen <dvainwebbc...@gmail.com> wrote:

> I have multiple images that I'm using that are of various types, and I'd
> like to create a macro that can easily create the image code I need without
> having to switch over to my containing folder and find the image
> individually (I use TiddlyDesktop).  Is there some way I can determine if a
> file exists from TiddlyWiki before I try to use it as an image's path?
>
> For example, I wanna generate the following:
>
> <img src="Race_Vulcan.jpg" class="basic_image">
>
> I can generate the line as-is with a macro easily, but I'd like the macro
> to change the extension of the filename if the file doesn't exist.  That
> way, all I have to type is <<fetch_image Race_Vulcan>> and it will generate
> the first <img> line if a file called Race_Vulcan.jpg exists, or fall back
> to Race_Vulcan.png, .bmp. etc if it does not.
>
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David Allen

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