var has_research = true;
var balloon_intv = null;
var balloon_wait = 250;
var balloon_node = null;
var balloon_chkNode = null;

function init_research()
{
	var tables = document.getElementsByTagName("TABLE");
	var i, len = tables.length;
	var tags, x, xlen;
	var y, ylen;
	var init_balloon = false, sort_columns;
	
	// apply onclick event to pdf links and mouseover events to 'report'
	// links for balloon popup text
	
	tags = document.getElementsByTagName("A");
	xlen = tags.length;
	
	for (x = 0; x < xlen; x++)
		if ( tags[x].getAttribute("href").indexOf("pdf_download.php") > -1 )
			tags[x].onclick = click_research;
	
	// do not sort columns on "/research/index.php"
	sort_columns = Boolean( has_research || ( /research[\/]?/i.test(location.href) || /research\/index\.php$/i.test(location.href) ));
	
	// apply mouse over effects to research tables
	for (i = 0; i < len; i++)
	{
		if ( tables[i].className.indexOf("research") > -1 )
		{
			if ( !init_balloon )
			{
				// if there is a 'research' table, we should have "balloon text" to show
				
				initialize_balloon_text();
				init_balloon = true;
			}
			
			// do not sort columns on "/research/index.php"
			if ( !sort_columns ) return;
			
			tags = document.getElementsByTagName("TR");					// all rows in the table
			xlen = tags.length;
			for (x = 0; x < xlen; x++)
			{
				if ( tags[x].className.indexOf("header") > -1 )
				{
					ylen = tags[x].childNodes.length;
					for (y = 0; y < ylen; y++)
					{
						if ( tags[x].childNodes[y].nodeType == 1 		// looking for the "TH" tags
								&& tags[x].childNodes[y].className.indexOf("headercol_inactive") == -1 )
						{
							if ( isDOM )
							{
								tags[x].childNodes[y].addEventListener("mouseover", headercol_over, false);
								tags[x].childNodes[y].addEventListener("mouseout", headercol_out, false);
								tags[x].childNodes[y].addEventListener("click", headercol_click, false);
							} else {
								tags[x].childNodes[y].attachEvent("onmouseover", headercol_over);
								tags[x].childNodes[y].attachEvent("onmouseout", headercol_out);
								tags[x].childNodes[y].attachEvent("onclick", headercol_click);
							}
						}
					}
				}
			}
		}
	}
}

function click_research(e)
{
	window.open(this.getAttribute("href"), "_blank");
	
	return( false );
}

function headercol_over(e)
{
	var target;
	
	e = getCommonEvent(e || event);
	target = e.target;
	
	if ( target.tagName == "A" )
		target = e.target.parentNode;
	
	target.className = target.className.replace(/headercol/, "headercol_over");
}

function headercol_out(e)
{
	var target;
	
	e = getCommonEvent(e || event);
	target = e.target;
	
	if ( target.tagName == "A" )
		target = e.target.parentNode;

	target.className = target.className.replace(/headercol_over/, "headercol");
}

function headercol_click(e)
{
	var target, index = 0;
	
	e = getCommonEvent(e || event);
	target = e.target;
	
	if ( target.tagName == "A" )
		target = e.target.parentNode;
	
	while ( target.childNodes[index].nodeType != 1 )						// looking for the anchor inside the 'TR.Header TH'
		index += 1;
	
	target.childNodes[index].onclick = function() { return( false ); }
	location.href = target.childNodes[index].href;
}

function initialize_balloon_text()
{
	var tags = document.getElementsByTagName("A");
	var i, len = tags.length;
	
	for (i = 0; i < len; i++)
	{
		if ( tags[i].className.indexOf("report") > -1 )
		{
			if ( isDOM )
			{
				tags[i].addEventListener("mouseover", load_balloon_text, false);
				tags[i].addEventListener("mouseout", clear_balloon_text, false);
			} else {
				tags[i].attachEvent("onmouseover", load_balloon_text);
				tags[i].attachEvent("onmouseout", clear_balloon_text);
			}
		}
	}
}

function clear_balloon_text(e)
{
	hide_balloon_text();
	balloon_chkNode = null;
}

function load_balloon_text(e)
{
	hide_balloon_text();

	e = getCommonEvent(e || event);
	
	balloon_chkNode = e.target;
	balloon_intv = setTimeout(show_balloon_text, balloon_wait);
}

function show_balloon_text()
{
	if ( balloon_chkNode != null )
	{
		if ( balloon_node )
			hide_balloon_text();
				
		if ( ( balloon_node = document.getElementById( "balloon_"+ balloon_chkNode.getAttribute("id") ) ) )
		{
			var info = getNodeInfo(balloon_chkNode);
			
			balloon_node.style.top = (info.y - 70) +"px"; //(info.y - 200) +"px";
			balloon_node.style.left = balloon_chkNode.offsetWidth - 10 +"px";		// 10px right padding from the end
			balloon_node.style.display = "block";
		}

		balloon_chkNode = null;
	}
	if ( balloon_intv )
	{
		clearTimeout( balloon_intv );
		balloon_intv = null;
	}
}

function hide_balloon_text()
{
	if ( balloon_node != null )
	{
		balloon_node.style.display = "none";
		balloon_node = null;
	}
	clearTimeout( balloon_intv );
	balloon_intv = null;
}

if ( isDOM )
	window.addEventListener("load", init_research, false);
else
	window.attachEvent("onload", init_research);