xy page

gistfile1.js

<script>
$(function () {
  
  var msie6 = $.browser == 'msie' && $.browser.version < 7;
  
  if (!msie6) {
    var top = $('#hot-cat').offset().top - parseFloat($('#hot-cat').css('margin-top').replace(/auto/, 0));
    $(window).scroll(function (event) {
      // what the y position of the scroll is
      var y = $(this).scrollTop();
      
      // whether that's below the form
      if (y >= top) {
        // if so, ad the fixed class
        $('#hot-cat').addClass('fixed');
      } else {
        // otherwise remove it
        $('#hot-cat').removeClass('fixed');
      }
      if (y >= top) {
        // if so, ad the fixed class
        $('html').addClass('scrolled');
      } else {
        // otherwise remove it
        $('html').removeClass('scrolled');
      }
      
    });
  }  
});
</script>

<scripb>

	//scroll-effect-function
	var msie6 = $.browser == 'msie' && $.browser.version < 7;

	  if (!msie6) {
	    var top = $('#hot-cat').offset().top - parseFloat($('#hot-cat').css('margin-top').replace(/auto/, 30));
	    $(window).scroll(function (event) {
	      // what the y position of the scroll is
	      var y = $(this).scrollTop();

	      // whether that's below the form
	      if (y >= top) {
	        // if so, ad the fixed class
	        $('body').addClass('body-scroll');
	      } else {
	        // otherwise remove it
	        $('body').removeClass('body-scroll');
	      }

	    });
	  }



	     var $win = $(window)
		      , $nav = $('.subnav')
		      , navTop = $('.subnav').length && $('.subnav').offset().top - 40
		      , isFixed = 0

		    processScroll()

		    // hack sad times - holdover until rewrite for 2.1
		    $nav.on('click', function () {
		      if (!isFixed) setTimeout(function () {  $win.scrollTop($win.scrollTop() - 47) }, 10)
		    })

		    $win.on('scroll', processScroll)

		    function processScroll() {
		      var i, scrollTop = $win.scrollTop()
		      if (scrollTop >= navTop && !isFixed) {
		        isFixed = 1
		        $nav.addClass('subnav-fixed')
		      } else if (scrollTop <= navTop && isFixed) {
		        isFixed = 0
		        $nav.removeClass('subnav-fixed')
		      }
		    }
</script>