function Browser() {
  var ua, s, i;
  this.isIE    = false;
  this.isNS    = false;
  this.version = null;
  ua = navigator.userAgent;
  s = "MSIE";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isIE = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;  }
 s = "Netscape6/";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;  }
  s = "Gecko";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = 6.1;
    return;  }}
var browser = new Browser();
var dragObj = new Object();
dragObj.zIndex = 0;
function dragStart(event, id) {
  var el;
  var x, y;
  if (id)
dragObj.elNode = document.getElementById(id);
  else {
    if (browser.isIE)
      dragObj.elNode = window.event.srcElement;
    if (browser.isNS)
      dragObj.elNode = event.target;
    if (dragObj.elNode.nodeType == 3)
      dragObj.elNode = dragObj.elNode.parentNode;}
  if (browser.isIE) { x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop + document.body.scrollTop;}
if (browser.isNS) {
    x = event.clientX + window.scrollX;
    y = event.clientY + window.scrollY;}
  dragObj.cursorStartX = x;
  dragObj.cursorStartY = y;
  dragObj.elStartLeft  = parseInt(dragObj.elNode.style.left, 10);
  dragObj.elStartTop   = parseInt(dragObj.elNode.style.top,  10);

  if (isNaN(dragObj.elStartLeft)) dragObj.elStartLeft = 0;
  if (isNaN(dragObj.elStartTop))  dragObj.elStartTop  = 0;
  dragObj.elNode.style.zIndex = dragObj.zIndex;
  if (browser.isIE) {
    document.attachEvent("onmousemove", dragGo);
    document.attachEvent("onmouseup",   dragStop);
    window.event.cancelBubble = true;
    window.event.returnValue = false;}
  if (browser.isNS) {
    document.addEventListener("mousemove", dragGo,   true);
    document.addEventListener("mouseup",   dragStop, true);
    event.preventDefault();}}

function dragGo(event) {var x, y;
if (browser.isIE) {x = window.event.clientX + document.documentElement.scrollLeft + document.body.scrollLeft; y = window.event.clientY + document.documentElement.scrollTop + document.body.scrollTop;}
if (browser.isNS) {x = event.clientX + window.scrollX;y = event.clientY + window.scrollY;}
dragObj.elNode.style.left = (dragObj.elStartLeft + x - dragObj.cursorStartX) + "px";
dragObj.elNode.style.top  = (dragObj.elStartTop  + y - dragObj.cursorStartY) + "px";
if (browser.isIE) {window.event.cancelBubble = true;
window.event.returnValue = false;}
if (browser.isNS)event.preventDefault();}
function dragStop(event) {if (browser.isIE) {document.detachEvent("onmousemove", dragGo);document.detachEvent("onmouseup",   dragStop);}
if (browser.isNS) {document.removeEventListener("mousemove", dragGo,   true);document.removeEventListener("mouseup",   dragStop, true);
  }}
//]]>