function ir_toggle(elm) {
	var list = $A(document.getElementsByClassName('history_item'));
	list.each(function(ele) {
		var div = ele.childElements();
		div.each(function(el) {el.className = 'off'});
	});
	
	var n = $(elm).id;

	$(n).className = 'on';
	var desc = $(n).title;
	var path = $(n).src;
	
	//Extract last 6 characters from thumbnail path and create path for big image.
	path = 'images/cat-' + path.substr(path.length-6, path.length);
	
	$('big-pic').src = path;
	$('big-pic').alt = desc;
	$('big-pic').title = desc;
	
	$('h_desc').innerHTML = desc;
}

function init_dw_Scroll() {
    var wndo = new dw_scrollObj('wn', 'lyr1', 'thumb');
    wndo.setUpScrollbar("dragBar", "track", "h", 1, 1);
    wndo.setUpScrollControls('scrollbar');
	$('big-pic').src = "images/cat-01.gif";// To display the image on load in IE 6
}

// if necessary objects exists link in the style sheet and call the init function onload
if ( dw_scrollObj.isSupported() ) {
    //dw_writeStyleSheet('css/scroll.css');
    dw_Event.add( window, 'load', init_dw_Scroll);
}