// JavaScript Document

// Navi //
// Author:		Saschat
// Customer; 	HIH
// Company:		Phase4

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];}
}

/**
 * Transforms a standard text-based navigation to an image-based
 * version. Installs event-listeners based on the functions noted above.
 * The function is unobstrusive, so you don't need to worry about the
 * page not being navigational after call-up.
 * 
 * @param {Element,String} container The element that contains the navigation that we shall replace
 * @param {String} selector A valid selector that will help us find the navigation elements
 * @param {Object} images A "hash" of images, where the nav-text is the key. The value must have a src-key and can have a swapSrc-key
 */
function showImageNavigation(container, selector, images) {
	//expand container and off we go
	container = $(container);
	
	if (!container) {
		return;
	}
	
	//grab the nav elements
	container.select(selector).each(function(s) {
		//try to grab text
		var navText = s.firstChild.nodeValue;
		
		//if we found a string and have the appropriate key
		if (Object.isString(navText) && images[navText]) {
			var navImg = new Element('img', { src: images[navText].src, alt: navText, title: navText, id: navText.camelize() });
		
			//replace nav elements content by image
			s.update(navImg);
			
			//if we were advised to swap images, we do so
			if (images[navText].swapSrc) {
				s.observe('mouseover', function() { MM_swapImage(navText.camelize(), '', images[navText].swapSrc, 1); });
				s.observe('mouseout', MM_swapImgRestore);
			}
		}
	});
}