function swap_image(target, src){
	var object = document.getElementById(target);
	var parent = object.parentNode;

	object.src = src;

	// generate href for full-sized image
	var exp = src.split('/');
	exp.splice(exp.length-2, 1);
	var _src = exp.join('/');

	parent.href = _src;
}

function swap_image(target, src, big){
	var object = document.getElementById(target);
	var parent = object.parentNode;

	object.src = src;
	// generate href for full-sized image
	var exp = src.split('/');
	exp.splice(exp.length-2, 1);
	var _src = exp.join('/');
	
	var exp = big.split('/');
	exp.splice(exp.length-2, 1);
	var _big = exp.join('/');

	parent.href = big;
}