// Copyright (C) 2005-2008 Ilya S. Lyubinskiy. All rights reserved.
// Technical support: http://www.php-development.ru/
//
// YOU MAY NOT
// (1) Remove or modify this copyright notice.
// (2) Re-distribute this code or any part of it.
//     Instead, you may link to the homepage of this code:
//     http://www.php-development.ru/javascripts/dropdown.php
//
// YOU MAY
// (1) Use this code on your website.
// (2) Use this code as part of another product.
//
// NO WARRANTY
// This code is provided "as is" without warranty of any kind.
// You expressly acknowledge and agree that use of this code is at your own risk.


// ***** Popup Control *********************************************************

var lastCId;

// ***** at_show_aux *****
function at_show_aux(parent, child)
{
	var p = document.getElementById(parent);
	var c = document.getElementById(child );

	if (lastCId)
	{
		document.getElementById(lastCId).style.visibility = 'hidden';
	}  
	lastCId = c.id;
	
	var pPos = findPos(p);
	
	var top  = (c["at_position"] == "y") ? pPos[1] + p.offsetHeight + 2 : pPos[1];
	var left = (c["at_position"] == "x") ? pPos[0] + p.offsetWidth + 2 : pPos[0];

	top = top + c["at_topOffset"];
	left = left + c["at_leftOffset"];
	c.style.position   = "absolute";
	c.style.top        = top +'px';
	c.style.left       = left+'px';
	c.style.visibility = "visible";
}

// ***** at_show *****

function at_show()
{
	var p = document.getElementById(this["at_parent"]);
	var c = document.getElementById(this["at_child" ]);

	at_show_aux(p.id, c.id);
	clearTimeout(c["at_timeout"]);
}

// ***** at_hide *****

function at_hide()
{
	var c = document.getElementById(this["at_child"]);
	c["at_timeout"] = setTimeout("document.getElementById('"+c.id+"').style.visibility = 'hidden'", 500);
}

// ***** at_click *****

function at_click()
{
	var p = document.getElementById(this["at_parent"]);
	var c = document.getElementById(this["at_child"]);
	if (lastCId)
	{
		at_hide();
	}
	lastCId = c.id;
  
	if (c.style.visibility != "visible") at_show_aux(p.id, c.id); else c.style.visibility = "hidden";
	return false;
}

// ***** at_attach *****

// PARAMETERS:
// parent   - id of the parent html element
// child    - id of the child  html element that should be droped down
// showtype - "click" = drop down child html element on mouse click
//            "hover" = drop down child html element on mouse over
// position - "x" = display the child html element to the right
//            "y" = display the child html element below
// cursor   - omit to use default cursor or specify CSS cursor name
// topOffset- vertical adjustment for the popup window's default location
// leftOffset- horizontal adjustment for the popup window's default location

function at_attach(parent, child, showtype, position, cursor, topOffset, leftOffset)
{
	if (topOffset === "undefined") { topOffset = 0; }
	if (leftOffset === "undefined") { leftOffset = 0; }
	var p = document.getElementById(parent);
	var c = document.getElementById(child);

	p["at_parent"]     = p.id;
	c["at_parent"]     = p.id;
	p["at_child"]      = c.id;
	c["at_child"]      = c.id;
	p["at_position"]   = position;
	c["at_position"]   = position;
	c["at_topOffset"]   = topOffset;
	c["at_leftOffset"]   = leftOffset;

	c.style.position   = "absolute";
	c.style.visibility = "hidden";

	if (cursor != undefined) p.style.cursor = cursor;

	switch (showtype)
	{
		case "click":
			p.onclick     = at_click;
			p.onmouseout  = at_hide;
			c.onmouseover = at_show;
			c.onmouseout  = at_hide;
		break;
		case "hover":
			p.onmouseover = at_show;
			p.onmouseout  = at_hide;
			c.onmouseover = at_show;
			c.onmouseout  = at_hide;
		break;
	}
}

function getStyle(oElm, strCssRule){
	var strValue = "";
	if(document.defaultView && document.defaultView.getComputedStyle){
		strValue = document.defaultView.getComputedStyle(oElm, "").getPropertyValue(strCssRule);
	}
	else if(oElm.currentStyle){
		strCssRule = strCssRule.replace(/\-(\w)/g, function (strMatch, p1){
			return p1.toUpperCase();
		});
		strValue = oElm.currentStyle[strCssRule];
	}
	return strValue;
}

function findPos(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft;
		curtop = obj.offsetTop;
		while (obj != null) {
			obj = obj.offsetParent;
			if (getStyle(obj, "position") != "static") { break; }
			curleft += obj.offsetLeft;
			curtop += obj.offsetTop;
		}
	}
	return [curleft,curtop];
}