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

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;
}

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;");
}

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;
}


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;
}


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

  popup_mouseup(e);
  element.style.display = 'none';
}

function popup_show(id, drag_id, exit_id, position, x, y, position_id)
{
  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;

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

  element.style.left = (document.documentElement.scrollLeft+(x)-200)+'px';
  element.style.top  = (document.documentElement.scrollTop +(y)-200)+'px';

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

  exit_element.onclick     = popup_exit;
}

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);