function image_swap(id_object, image_name) {
	id_object.src='http://www.creativehandbook.com/images/'+image_name;
}

function image_swap_multi_category(id_object, image_name_down, image_name_up) {
	if (category_dropdown_visible == false) {
		id_object.src='http://www.creativehandbook.com/images/'+image_name_down;
	} else {
		id_object.src='http://www.creativehandbook.com/images/'+image_name_up;
	}
}

function image_swap_multi_category_dropdown(id_object, image_name_down, image_name_up) {
	if (category_dropdown_expand == false) {
		id_object.src='http://www.creativehandbook.com/images/'+image_name_down;
	} else {
		id_object.src='http://www.creativehandbook.com/images/'+image_name_up;
	}
}