Cash offer, but get financing in the end

[Amy Canfield]

I listened to a BP podcast a while back where they talked about making cash offers, but then getting a loan for the property before the close date.  I'd like to do this.  How do I go about it?  What specifically should be written in my offer?  Do you have to show proof you have cash when making a cash offer?  I have the money, so I'm not trying to be deceptive.