startList = function() {
  if (document.all && document.getElementById) {
    navRoot = document.getElementById("nav");
    var lists = navRoot.childNodes; 
    for (var i=0; i<lists.length; i++) {
      node = lists[i];
      if (node.nodeName=="LI") {
        node.onmouseover=function() {
			this.origClassName = this.className;
			this.className = this.className + "_over";
	  		var items = this.getElementsByTagName("ul" );
			for ( var i = 0; i < items.length; i++ )  {
				items[i].style.display = "block";
			}
        };
        node.onmouseout=function() {
			if ( this.origClassName ) {
				this.className = this.origClassName;
			}
	  		var items = this.getElementsByTagName("ul" );
          	for ( var i = 0; i < items.length; i++ )  {
                items[i].style.display = "none";
          	}
		};
      }
    }
  }
  
  //preload navigation images
	window.preloadImages = [
		"../img/Nav_Aerobic_blue.gif",
		"../img/Nav_Aerobic_green.gif",
		"../img/Nav_Aerobic_grey.gif",
		"../img/Nav_Aerobic_orange.gif",
		"../img/Nav_Aerobic_pink.gif",
		"../img/Nav_Aerobic_red.gif",
		"../img/Nav_Dance_blue.gif",
		"../img/Nav_Dance_green.gif",
		"../img/Nav_Dance_grey.gif",
		"../img/Nav_Dance_orange.gif",
		"../img/Nav_Dance_pink.gif",
		"../img/Nav_Dance_red.gif",
		"../img/Nav_Fitness_blue.gif",
		"../img/Nav_Fitness_green.gif",
		"../img/Nav_Fitness_grey.gif",
		"../img/Nav_Fitness_orange.gif",
		"../img/Nav_Fitness_pink.gif",
		"../img/Nav_Fitness_red.gif",
		"../img/Nav_Yoga_blue.gif",
		"../img/Nav_Yoga_green.gif",
		"../img/Nav_Yoga_grey.gif",
		"../img/Nav_Yoga_orange.gif",
		"../img/Nav_Yoga_pink.gif",
		"../img/Nav_Yoga_red.gif"		
	];
	
	for ( var i = 0; i < window.preloadImages.length; i++ ) {
		var img = document.createElement( "img" );
		img.src = window.preloadImages[i];
	}

  
}
window.onload=startList;// JavaScript Document

txtWnd = null;
function open_window(url,h,w)
{ 
	if ( txtWnd != null )
	{
		if ( !txtWnd.closed )
		{
			txtWnd.close();
			txtWnd = null;
		}
	}

	if (document.all)
		txtWnd = window.open(url,'','height='+h+',width='+w+',top=100,left=200,scrollbars=0,resizable=0');
	else
		txtWnd = window.open(url,'','height='+h+',width='+w+',screenX=100,screenY=200,scrollbars=0,resizable=0');

	txtWnd.focus();
}