Wordpress may or may not support PNGs. In that case exchange the URL in the "img src=" tag with "[link]
", for the JPEG.
As for the sizing. The sizing can be changed by manually entering " width="" and height="" " tags within the img src tag some where after border="0".
I hope this makes sense. If you know the column width in wordpress I can probably make you a custom code, but right now I'm going to sleep.