[OSM-newbies] WMS to jpeg/png

[Xan]

Hi,

Is there any possibility of convert WMS download layers to jpeg or png 
image?
I use josm. I donwload an WMS are (for example from Yahoo WMS). I want 
to save these sequences of images as jpeg or png.

Yes, I know them copyright infringments in most of WMS, but there are 
few of that that not restrict the use. So, please, don't say copyright 
remindme's. Only tech stuff.

Thanks in advance,
Xan.