Variable range scrollback for archive images

For a given image of class=’camview’  this jQuery javascript will scroll back a variable amount depending on the mouse location over the image.

The mouse over right edge of the image represents the most recent image from the archive. The bottom-left corner represents 24 hours ago. But to have finer granularity at reviewing more recent images, scrolling the mouse over the top of the image will scroll back one time-increment every 10 pixels. Moving the mouse from right to left over the bottom of the image will scroll back over a full 24 hours (1440 one-minute images) skipping frames as needed to fit the mouse resolution. Mouse heights between the top and bottom edges will have a linearly scaled proportion of archive history.

$('.camview').mousemove(function(event) {
 var x = event.pageX - $(this).offset().left;
 var y = event.pageY - $(this).offset().top;
 var mindx = 0.1;
 var maxdx = 1440.0 / $(this).width();
 var dy = 1.0 - y / $(this).height();
 var dx = dy * mindx + (1.0-dy) * maxdx;
 var arc = ($(this).width() - x) * dx;
 $(this).find('img').attr('src', 'camjpg.php?cam=' + $(this).attr('id') + '&arc=' + arc.toFixed(0));