Embed the output of a in HTML

I have a php script I can't edit because it's external to my website. After the <form> submit, it redirects me to an image that's also external. I want the image, instead, to be shown inside of my website. This is the code:

<FORM target=_blank action="http://ift.tt/1E31OvF" METHOD="get">
<input type="text" name="codigo">
<input type="hidden" value="1234" name="id">
<input type="hidden" value="69" name="precio">
<input type="submit" value="Comprar">
</form>

What can I do? I hope you can help me, thanks a lot!