function swapPic(container, trigger) {
	var thumbGallery = $(trigger).select('li');
	thumbGallery.each(function(el) {
		el.onclick = function() {
			$(container).style.background = "url(/static/img/masthead/" + el.id + ".jpg) top left no-repeat";
		}	
	});
}

/************ dom ready function calls *************/
Event.onDOMReady(function(){
	swapPic('mast', 'thmbGallery');
});