$(function () {
		  
		  var msie6 = $.browser == 'msie' && $.browser.version < 7;
		  
		  if (!msie6) {
			var top = $('#comment').offset().top - parseFloat($('#comment').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
				$('#comment').addClass('fixed');
			  } else {
				// otherwise remove it
				$('#comment').removeClass('fixed');
			  }
			});
		  }  
		});