jquery next image distance

A coder who writes jQuery every day, this is for you. My goal is to insert a <div> automatically after any Heading (h1,h2,h3,h4), using the jQuery(':header').after( function(j) { }, and this is working. The <div> will contain an ad with a picture and a line of text, which is also working. The <div> is float:right so subsequent text flows around it, also working. My code checks the position of the current spot and the previous insertion, using [login to view URL]().top, and doesn't insert another ad <div> unless the distance is greater than 900, which is working. So far, so good. But now I want to improve this code, and NOT insert the ad <div> if there is another picture nearby. "Nearby" will mean, no subsequent picture with [login to view URL]().top less than 900 difference from current top. My problem: I'm not good with jQuery. Everything is a struggle for me. The subsequent pictures can be subsequent Siblings, or Children of the current Heading found with jQuery'(:header'). It will not be a Parent of the current Header. Your Task: create jQuery code that works inside this function: jQuery(':header').after( function(j) { } which finds the next subsequent 'img' in the DOM, sibling or any child deeper, and gets its 'top' and subtracts the current top to determine if less than 900. If one elegant jQuery can't do it, feel free to code several loops to find them, then find the nearest, then compare. This will run on webpages running Wordpress on typical modern browsers. Don't worry about editing my webpages, I can do that. You should create your own test webpage, to do the debugging and verification that it works. Your test webpage is up to you, it can be localhost or on some website hosted that you control. I will not provide a test website for you. So don't bid unless you can accomplish the testing yourself. After you provide working code, I will incorporate it, and probably ask you a few questions about things in the code that I don't understand. I prefer to work with individuals, not someone representing a team of people. Those whose team auto-responds will be ignored. You must tell me something in your reply, that indicates you read my entire proposal. I need someone to begin work immediately, and finish within 6 hours. Please tell me you can start immediately and have time to work now, not tomorrow.