This thread seems to deal with the same issue (amongst other things):

http://forums.sketchucation.com/viewtopic.php?f=15&t=14353&p=108605

It seems not, which is annoying. I'm going to see if Layout can do something for me.

I'd welcome this as well.

I've developed my own manual work-around to essentially create my own images and substitute them for the ones created by the Sketchup web-exporter. Once you generate one web export say for 36 images you can re-use the html code multiple times and simply replace the images with those that you create on your own.

see my post here: