function HpbImgPreload()
{
  var appVer=parseInt(navigator.appVersion);
  var isNC=false,isN6=false,isIE=false;
  if (document.all && appVer >= 4) isIE=true; else
    if (document.getElementById && appVer > 4) isN6=true; else
      if (document.layers && appVer >= 4) isNC=true;
  if (isNC||isN6||isIE)
  {
    if (document.images)
    {
      var imgName = HpbImgPreload.arguments[0];
      var cnt;
      swImg[imgName] = new Array;
      for (cnt = 1; cnt < HpbImgPreload.arguments.length; cnt++)
      {
        swImg[imgName][HpbImgPreload.arguments[cnt]] = new Image();
        swImg[imgName][HpbImgPreload.arguments[cnt]].src = HpbImgPreload.arguments[cnt];
      }
    }
  }
}
// HpbImgFind:
//
function HpbImgFind(doc, imgName)
{
  for (var i=0; i < doc.layers.length; i++)
  {
    var img = doc.layers[i].document.images[imgName];
    if (!img) img = HpbImgFind(doc.layers[i], imgName);
    if (img) return img;
  }
  return null;
}
// HpbImgSwap:
//
function HpbImgSwap(imgName, imgSrc)
{
  var appVer=parseInt(navigator.appVersion);
  var isNC=false,isN6=false,isIE=false;
  if (document.all && appVer >= 4) isIE=true; else
    if (document.getElementById && appVer > 4) isN6=true; else
      if (document.layers && appVer >= 4) isNC=true;
  if (isNC||isN6||isIE)
  {
    if (document.images)
    {
      var img = document.images[imgName];
      if (!img) img = HpbImgFind(document, imgName);
      if (img) img.src = imgSrc;
    }
  }
}
var swImg; swImg=new Array;

$(function() {
	var nav = $('.nav');
	var article = $('.article');
	var navTop = nav.offset().top;
		var navTop = nav.offset().top;
	$(window).scroll(function () {
		var winTop = $(this).scrollTop();
		if (winTop >= navTop) {
			nav.addClass('fixed')
			article.addClass('fixed2')
		} else if (winTop <= navTop) {
			nav.removeClass('fixed')
			article.removeClass('fixed2')
		}
	});
});

$(document).ready(function() {
	$("a.scrollable").scrollableLink()
});

jQuery.fn.scrollableLink = function() {
	return this.each(function(){
		var $anchr = $(this);
		$anchr.click(function(e) {	
			e.preventDefault()
			var target = $anchr.attr('href');
			var speed = $anchr.data('speed') || 800;
			var easing = $anchr.data('easing');
			var top = $(target).length > 0 ? $(target).offset().top : 0;
			$("html:not(:animated),body:not(:animated)")
				.stop()
				.animate({ scrollTop: top }, speed, easing, function() {
					window.location.hash = target;
				});
		  	return false;
		})
	})
}