Image Sizes

[atdegs]

If I add an image to a thread by linking to an image on the web (not my own image), is there any way to specify the image size? In HTML it would be something like:
<img src="img_girl.jpg" alt="Girl in a jacket" style="width:500px;height:600px;">

HTML doesn't work in posts though, and I don't see any way to specify this with the