jquery - Scroll to top of element when near top of window -

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i trying achieve following:

i have div, when it's @ top of page want automatically scroll top of div.

here script have far. can see (i hope). when #plus between 250 , 20 px top of page, want run animation positions #editions @ top of page. however, animation executed many times, , keeps on going. think it's being triggered every value in range between 250 , 20, 230 times. i'm not sure if i'm going right way.

// scroll editions // function scrolleditions(){     $('html, body').animate({     scrolltop: $("#plus").offset().top }, 1200, 'easeoutquint').delay(200).animate({     scrolltop: $("#editions").offset().     }, 800, 'easeoutquint'); };  // scrolling check // function showhidetitles(){     // distance of elements frop top //     var ptop2 = math.round($('#plus').offset().top - $(window).scrolltop());        // plus top      // auto scrolling //     if (ptop2 <= 240 && ptop2 >= 20){         scrolleditions();     } };  $(window).scroll(function(){     showhidetitles() });

if rolling own implementation want use debounce function trigger action once within given interval.

http://underscorejs.org/#debounce

http://jsfiddle.net/puleos/j67eg/40/

 var fn = _.debounce(showhidetitles, 300);   $(window).scroll(fn);

if want jquery library handle scroll events waypoints pretty good.
http://imakewebthings.com/jquery-waypoints/


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