function swapImg(){
	var path = this.src.split('/');
	var filename = path[path.length-1];
	document.getElementById('large_photo').src = 'images/hires/' + filename;
	return false;
}

function init(){
	var photos = document.getElementById('rightcol').getElementsByTagName('IMG');
	for(var i = 1; i < photos.length; i++){
		photos[i].onclick = swapImg;
	}
}
window.onload = init;