The Lounge is rated PG. If you're about to post something you wouldn't want your
kid sister to read then don't post it. No flame wars, no abusive conduct, no programming
questions and please don't post ads.
Link to an image from a site you have developed using legally obtained images. The day the site is published on t'webs for the first time for testing, immediately send an email to the MD of the company demanding payment for use of the copyrighted image and threatening legal action.
Seriously, just explain to them, preferably in writing, that google images are just links and at you wil not use images illegally. If they want you to source free images only the you will do so, but will need to charge them for your time in sourcing those free images - and so it may be cheaper for them to agree to pay for stock library images or to source their own.
If they are really cheap they will source eir own and you just need to get them to confirm in writing at they are legally entitled to use those images.