function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}


// functions for positioning menu
var menuNode;
var menu_height;
var page_height ;

function initialiseMenu(){
	menuNode = document.getElementById('menu');
	if (menuNode != null){
		menu_height = menuNode.offsetHeight;
		page_height = document.body.scrollHeight;

		if (menu_height  < page_height + 450){
			if (window.addEventListener){
				window.addEventListener('scroll', updateMenu, false);
			} else if (window.attachEvent){
				window.attachEvent('onscroll', updateMenu);
			}
		} else {
			document.getElementById('inside_left').style.height = (menu_height+30)+'px';
			menuNode.style.top = '0px';
			menuNode.style.position = 'relative';
		}
	}
}

function updateMenu(){
  if (window.XMLHttpRequest){
    var offset = 0;

		if (window.pageYOffset){
			offset = window.pageYOffset;
		}else if (document.documentElement && document.documentElement.scrollTop){
			offset = document.documentElement.scrollTop;
		}else if (document.body){
			offset = document.body.scrollTop;
		}
		
		if (offset < 420){
		  var top = 450 - offset;
		} else if  (menu_height + offset > page_height){
			var top = page_height - menu_height - offset - 100;
		} else {
		  var top = 30;
		}
		
		if (menuNode != null){
			menuNode.style.top = top + 'px';
		}
  }
}

//back to top function
function scroll_up_top() {
	$$('.back-to-top a').invoke('observe', 'click', function(e) {
	Effect.ScrollTo("top", {duration: 0.3});
	e.stop();
	 });
}