This patch - http://cvs.moodle.org/contrib/plugins/mod/turnitintool/turnitintool.js?r1=1.8&r2=1.8.2.1 - added ',resizable=1' onto the end of the options sent to window.open(). We found it didn't work and further investigation showed that the value of the 'option' variable only contained '1' (i.e. was an invalid parameter). Not sure why, but we are still looking.

My take on this would be to remove the third (options) parameter from window.open() altogether - many browsers ignore it and (IHO) it's a bit 'rude' imposing on users the window parameters.

I'm still looking at this and will add further info if/when I find it.