Well, if all you need is what you posted, then it takes a whole 20 mins, if that.
Sorry, I'm not going to bother with it as I don't take small projects, but don't pay anymore than $50 for something like that. It's a very simple script you're looking for, unless I got the requirements wrong.
The reason I asked is because you said you'd pay 50/50, meaning you're probably going to end paying a whole lot more than you need to.