// 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/popup-window.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.

// USAGE
//
// function popup_show(id, drag_id, exit_id, position, x, y, position_id)
//
// id          - id of a popup window;
// drag_id     - id of an element within popup window intended for dragging it
// exit_id     - id of an element within popup window intended for hiding it
// position    - positioning type:
//               "element", "element-right", "element-bottom", "mouse",
//               "screen-top-left", "screen-center", "screen-bottom-right"
// x, y        - offset
// position_id - id of an element relative to which popup window will be positioned


// ***** Variables *************************************************************

var popup_dragging = false;
var popup_target;
var popup_mouseX;
var popup_mouseY;
var popup_mouseposX;
var popup_mouseposY;
var popup_oldfunction;


// ***** popup_mousedown *******************************************************

function popup_mousedown(e)
{
  var ie = navigator.appName == "Microsoft Internet Explorer";

  popup_mouseposX = ie ? window.event.clientX : e.clientX;
  popup_mouseposY = ie ? window.event.clientY : e.clientY;
}


// ***** popup_mousedown_window ************************************************

function popup_mousedown_window(e)
{
  var ie = navigator.appName == "Microsoft Internet Explorer";

  if ( ie && window.event.button != 1) return;
  if (!ie && e.button            != 0) return;

  popup_dragging = true;
  popup_target   = this['target'];
  popup_mouseX   = ie ? window.event.clientX : e.clientX;
  popup_mouseY   = ie ? window.event.clientY : e.clientY;

  if (ie)
       popup_oldfunction = document.onselectstart;
  else popup_oldfunction = document.onmousedown;

  if (ie)
       document.onselectstart = new Function("return false;");
  else document.onmousedown   = new Function("return false;");
}


// ***** popup_mousemove *******************************************************

function popup_mousemove(e)
{
  var ie      = navigator.appName == "Microsoft Internet Explorer";
  var element = document.getElementById(popup_target);
  var mouseX  = ie ? window.event.clientX : e.clientX;
  var mouseY  = ie ? window.event.clientY : e.clientY;

  if (!popup_dragging) return;

  element.style.left = (element.offsetLeft+mouseX-popup_mouseX)+'px';
  element.style.top  = (element.offsetTop +mouseY-popup_mouseY)+'px';

  popup_mouseX = ie ? window.event.clientX : e.clientX;
  popup_mouseY = ie ? window.event.clientY : e.clientY;
}

// ***** popup_mouseup *********************************************************

function popup_mouseup(e)
{
  var ie      = navigator.appName == "Microsoft Internet Explorer";
  var element = document.getElementById(popup_target);

  if (!popup_dragging) return;

  popup_dragging = false;

  if (ie)
       document.onselectstart = popup_oldfunction;
  else document.onmousedown   = popup_oldfunction;
}

// ***** popup_exit ************************************************************

function popup_exit(e)
{
  var ie      = navigator.appName == "Microsoft Internet Explorer";
  var element = document.getElementById(popup_target);

  popup_mouseup(e);
  element.style.display = 'none';
  document.getElementById("overlay-popup").style.display = "none";
  document.getElementById("popup_body").innerHTML = "";
}


// ***** popup_show ************************************************************

function popup_show(popup_height, popup_width)
{
	var id = 'popup', drag_id = 'popup_drag', exit_id = 'popup_exit', position = 'screen-center', x = 0, y = 0;
  var element      = document.getElementById(id);
  var drag_element = document.getElementById(drag_id);
  var exit_element = document.getElementById(exit_id);

  var width        = window.innerWidth  ? window.innerWidth  : document.documentElement.clientWidth;
  var height       = window.innerHeight ? window.innerHeight : document.documentElement.clientHeight;
  
  /*if(popup_height)
  	document.getElementById("popup_body").style.height = popup_height + "px";
  else
  	document.getElementById("popup_body").style.height = "300px"; */

  element.style.position = "absolute";
  element.style.display  = "block";

  if (position == "element" || position == "element-right" || position == "element-bottom")
  {
    var position_element = document.getElementById(position_id);

    for (var p = position_element; p; p = p.offsetParent)
      if (p.style.position != 'absolute')
      {
        x += p.offsetLeft;
        y += p.offsetTop;
      }

    if (position == "element-right" ) x += position_element.clientWidth;
    if (position == "element-bottom") y += position_element.clientHeight;

    element.style.left = x+'px';
    element.style.top  = y+'px';
  }

  if (position == "mouse")
  {
    element.style.left = (document.documentElement.scrollLeft+popup_mouseposX+x)+'px';
    element.style.top  = (document.documentElement.scrollTop +popup_mouseposY+y)+'px';
  }

  if (position == "screen-top-left")
  {
    element.style.left = (document.documentElement.scrollLeft+x)+'px';
    element.style.top  = (document.documentElement.scrollTop +y)+'px';
  }

  if (position == "screen-center")
  {
    element.style.left = (document.documentElement.scrollLeft+(width -element.clientWidth )/2+x)+'px';
    element.style.top  = (document.documentElement.scrollTop +(height-element.clientHeight)/2+y)+'px';
  }

  if (position == "screen-bottom-right")
  {
    element.style.left = (document.documentElement.scrollLeft+(width -element.clientWidth )  +x)+'px';
    element.style.top  = (document.documentElement.scrollTop +(height-element.clientHeight)  +y)+'px';
  }

  drag_element['target']   = id;
  drag_element.onmousedown = popup_mousedown_window;

  exit_element.onclick     = popup_exit;
  
	/*if (window.innerHeight && window.scrollMaxY) {// Firefox
		height = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		height = document.body.scrollHeight;
	} else { // works in Explorer 6 Strict, Mozilla (not FF) and Safari
		height = document.body.offsetHeight;
	}*/


	if (window.innerHeight && window.scrollMaxY) {
		xScroll = window.innerWidth + window.scrollMaxX;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}

	var windowWidth, windowHeight;

	if (self.innerHeight) {	// all except Explorer
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth;
		} else {
			windowWidth = self.innerWidth;
		}
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}

	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else {
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){
		pageWidth = xScroll;
	} else {
		pageWidth = windowWidth;
	}

  document.getElementById("overlay-popup").style.height = pageWidth + "px";
  document.getElementById("overlay-popup").style.display = "block";
}


// ***** Attach Events *********************************************************

if (navigator.appName == "Microsoft Internet Explorer")
     document.attachEvent   ('onmousedown', popup_mousedown);
else document.addEventListener('mousedown', popup_mousedown, false);

if (navigator.appName == "Microsoft Internet Explorer")
     document.attachEvent   ('onmousemove', popup_mousemove);
else document.addEventListener('mousemove', popup_mousemove, false);

if (navigator.appName == "Microsoft Internet Explorer")
     document.attachEvent   ('onmouseup', popup_mouseup);
else document.addEventListener('mouseup', popup_mouseup, false);