Re: Can I do this?
Both are allowed, but make sure that the x10Hosting link doesn't make the implication that your site is endorsed, sponsored or run by x10Hosting ("powered by", "hosted with" or something similar would be fine; "brought to you by" would not). Depending on the nature of your site, though, it might not be a good idea to have a "donate" button and an "I'm getting my hosting for free" label on the same page. Not that it can't work -- I had a PayPal Donate button on a free site that (among other things) gave away code for the Lotus Domino platform, and that worked out nicely. If you are offering your visitors value, some will donate, but if it's something like a forum where (let's face it) the users themselves are providing the value and you tell them that there's no financial overhead, well, not so much.
“Beware of bugs in the above code; I have only proved it correct, not tried it.” --Donald Knuth
"It was as if its architects were given a perfectly good hammer and gleefully replied, 'neat! With this hammer, we can build a tool that can pound in nails.'" -- Alex Papadimoulis (on TheDailyWTF.com)