Basic element visibility checking. This example will print 'Onscreen' or 'Offscreen' depending on the location of the element at the time the detection was run.
// Is this element visible onscreen?
var visible = $(this).visible( detectPartial );
// Set the visible status into the span.
$(this).find('span').text( visible ? 'Onscreen' : 'Offscreen' ).toggleClass('visible',visible);
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Visibility detection
'Whole Element' will check if the entire element is visible on the screen.
'Par Element' will check if any part of the element is visible on the screen.