// JavaScript Document
Event.observe(window,'load',initDocument,false);

function initDocument(){
	switchActiveImage();
}


function switchActiveImage(){
	
	var ary = document.location.href.split('/');
	var filename = ary[ary.length-1];

	var elems = document.getElementById('my_menu').childNodes;
	
	for(var i=0; i<elems.length; i++){
		var elm = elems.item(i);
		
		if(elm.nodeName=='A'){
		  var href = elm.getAttribute('href');
		  if(href.match(filename)){
			  var img = elm.childNodes[0];
			  img.setAttribute('src', img.getAttribute("src").replace("_off.", "_on."));
		  }
		}
	}
	
}