jquery - Show an element only when scrolling through certain divs -


i have site lot of blank space (for visual reasons). when user scrolls through blank space (usually 2000px or above marked by.spacer) want fixed div show up.

the purpose make sure user doesn't have scroll through lot of blank space. div "pop-up" or appear simple have text pointing them navigation bar. when user isn't viewing .spacer, want div disappear/hide. how can using jquery? thank in advance time!

here example multiple .spacer blocks: http://jsfiddle.net/ant_ti/h8t6s/


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