//AJAX - Configuration
var obj = new Object();
obj.opened = 0;
var descr_text = new Array()

function new_ajax_object()
{
	if (window.XMLHttpRequest)
	{
		return(new XMLHttpRequest());
	}
	else if (window.ActiveXObject)
	{
		return(new ActiveXObject("Microsoft.XMLHTTP"));
	}
	return false;
}






function toggle_visibility(group_id)
{
	var div_elem = document.getElementById('box' + group_id);
	var a_elem = document.getElementById('switch' + group_id)

	switch (a_elem.className)
	{
		case 'month_mark_visible':
		 div_elem.style.display = "none";
		 a_elem.className = "month_mark_hidden";
		 break;
		case 'month_mark_hidden':
		 div_elem.style.display = "block";
		 a_elem.className = "month_mark_visible";
		 break;
		case 'year_mark_visible':
		 div_elem.style.display = "none";
		 a_elem.className = "year_mark_hidden";
		 break;
		case 'year_mark_hidden':
		 div_elem.style.display = "block";
		 a_elem.className = "year_mark_visible";
		 break;
	}
}

function hide_articles(first_hidden)
{
	var div_elem;
	var a_elem;
	group_id = first_hidden;
	while(div_elem = document.getElementById('box' + group_id))
	{
		a_elem = document.getElementById('switch' + group_id)

		switch (a_elem.className)
		{
		case 'month_mark_visible':
		 div_elem.style.display = "none";
		 a_elem.className = "month_mark_hidden";
		 break;
		case 'year_mark_visible':
		 div_elem.style.display = "none";
		 a_elem.className = "year_mark_hidden";
		 break;
		}
		group_id ++;
	}
}


function show_image(path,target)
{

	thumb_object = new_ajax_object();
	if (thumb_object)
	{
		thumb_object.open("GET", "show_image.php?path=" + path);
		thumb_object.onreadystatechange = function()
		{
			if (thumb_object.readyState == 4
			&& thumb_object.status == 200)
			{
				response = thumb_object.responseXML;
				target_element = document.getElementById(target);
				target_element.style.backgroundImage = response.getElementsByTagName("path")[0].childNodes[0].nodeValue;
				target_element.style.width = response.getElementsByTagName("width")[0].childNodes[0].nodeValue;
				target_element.style.height = response.getElementsByTagName("height")[0].childNodes[0].nodeValue;
				target_element.href = response.getElementsByTagName("fullsize")[0].childNodes[0].nodeValue;
			}
		}
		thumb_object.send(null);
	}
}




// AJAX - Get descriptions for some links 
function descr_get(id)
{

	if ( descr_text[id] )
	{
		document.getElementById('right_description').innerHTML = descr_text[id];
	}
	else 
	{
		descr_object = new_ajax_object();
		if(descr_object)
		{
			
			descr_object.open("GET", "ajax/descriptions.php?id=" + id);
			
			descr_object.onreadystatechange = function()
			{
				if (descr_object.readyState == 4 &&
				descr_object.status == 200)
				{
					descr_text[id] = descr_object.responseText;
					document.getElementById('right_description').innerHTML = descr_text[id];
				}
			}
			
			descr_object.send(null);
		}
	}
}


// AJAX - Empty description
function descr_empty(id)
{
	document.getElementById('right_description').innerHTML = "";
}