HTML code This header will turn blue if it moves past that line and stay green BEFORE that line HTML <div id="body"> <div id="header"> This header will turn blue if it moves past that line and stay green BEFORE that line</div> <hr/> <div id="largebody"></div> </div> css body { font: 12px arial; } #header { height: 40px; width: 100%; position: absolute; top: 0px; border: 1px solid green; } hr { position: relative; top: 120px; margin: 0px; } #body { overflow: scroll; height: 300px; } #largebody { height: 900px; } body { padding: 0px; } jquery $("#body").scroll( function() { var value = $(this).scrollT...