function genPaintingsResult(order_by){
	var query_frame = document.getElementById("query_frame");
	var country_id = document.getElementById("country_selected");
	var medium_id = document.getElementById("medium_selected");
	var order_by_field = document.getElementById("order_by");
	var current_page = document.getElementById("current_page");
	var PaintingRightBottom = document.getElementById("PaintingRightBottom");
	var get_value = "";
	
	if (order_by.length > 0){
		order_by_field.value = order_by;
	} else {
		order_by = order_by_field.value;
	}
		
	PaintingRightBottom.innerHTML = '<div><img src="images/loading.gif" width="20" /> Loading ...</div>';
	
	get_value += "order_by="+order_by;
	get_value += "&country_id="+country_id.value;
	get_value += "&medium_id="+medium_id.value;
	get_value += "&current_page="+current_page.value;
	
	query_frame.src = "inc/php/gen_paintings_result.php?"+get_value;
}

function firstPage(order_by){
	var current_page = document.getElementById("current_page");
	current_page.value = 0;
	genPaintingsResult(order_by);
}

function previousPage(){
	var current_page = document.getElementById("current_page");
	current_page.value--;
	genPaintingsResult('');
}

function nextPage(){
	var current_page = document.getElementById("current_page");
	current_page.value++;
	genPaintingsResult('');
}