//<script>
function getoffsetTop(itemRef){
  var iHeight=0;
  while (itemRef.tagName!="BODY"){
    iHeight+=itemRef.offsetTop;
    itemRef=itemRef.offsetParent;
  }
//iHeight=(IE5)?iHeight:iHeight;
  return  iHeight;
} 
function getoffsetLeft(itemRef){
  var iLeft=0;
  while (itemRef.tagName!="BODY"){
    iLeft+=itemRef.offsetLeft;
    itemRef=itemRef.offsetParent;
  }
//iHeight=(IE5)?iHeight:iHeight;
  return  iLeft;
} 


function Browser() {

  var ua, s, i;

  this.isIE    = false;
  this.isNS    = false;
  this.isIE6   = false;
  this.version = null;
  this.Width =0;
  this.Height=0;
  var MX=0;
  var MY=0;
  this.updateMouse=updateMouse; 
  this.MouseX=MouseX;
  this.MouseY=MouseY;
  
  function MouseX(){
    return MX
  }
  function MouseY(){
    return MY
  }
  
  function SetMouseX(evt) {
    if (evt.pageX) MX=evt.pageX;
    else if (evt.clientX)
       MX=evt.clientX + (document.documentElement.scrollLeft ?
       document.documentElement.scrollLeft :
       document.body.scrollLeft);
    else MX=-1;
  }
  function SetMouseY(evt) {
    if (evt.pageY) MY=evt.pageY;
    else if (evt.clientY)
       MY=evt.clientY + (document.documentElement.scrollTop ?
       document.documentElement.scrollTop :
       document.body.scrollTop);
    else MY=-1;
  }
  
  function updateMouse(evt){
    SetMouseX(evt);
    SetMouseY(evt);
  }

  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    this.Width = window.innerWidth;
    this.Height = window.innerHeight;
  } else if( document.documentElement &&
      ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    this.Width = document.documentElement.clientWidth;
    this.Height = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    this.Width = document.body.clientWidth;
    this.Height = document.body.clientHeight;
  }


  ua = navigator.userAgent;


  s = "MSIE";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isIE = true;
    this.version = parseFloat(ua.substr(i + s.length));
    document.attachEvent("onmousemove", this.updateMouse);
    return;
  }
  s = "Netscape6";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = parseFloat(ua.substr(i + s.length));
    document.addEventListener("mousemove", this.updateMouse,   true);
    return;
  }

  // Treat any other "Gecko" browser as NS 6.1.

  s = "Gecko";
  if ((i = ua.indexOf(s)) >= 0) {
    document.addEventListener("mousemove", this.updateMouse,   true);
    this.isNS = true;
    this.version = 6.1;
    return;
  }  
  
  
}

var browser = new Browser();

// Global object to hold drag information.

var dragObj = new Object();
dragObj.zIndex = 0;

function dragStart(event, id) {

//  var el=document.getElementById(id);
//  el.style.left=getoffsetLeft(el)+'px';
//  el.style.top=getoffsetTop(el)+'px';
//  el.style.position='fixed';
//  alert(el.style.top);

  var el;
  var x, y;

  // If an element id was given, find it. Otherwise use the element being
  // clicked on.

  if (id)
    dragObj.elNode = document.getElementById(id);
  else {
    if (browser.isIE)
      dragObj.elNode = window.event.srcElement;
    if (browser.isNS)
      dragObj.elNode = event.target;

    // If this is a text node, use its parent element.

    if (dragObj.elNode.nodeType == 3)
      dragObj.elNode = dragObj.elNode.parentNode;
  }
  // Get cursor position with respect to the page.

  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;
  }

  // Save starting positions of cursor and element.

  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;

  // Update element's z-index.

  dragObj.elNode.style.zIndex = ++dragObj.zIndex;

  // Capture mousemove and mouseup events on the page.

  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;

  // Get cursor position with respect to the page.

  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;
  }

  // Move drag element by the same amount the cursor has moved.

  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) {

  // Stop capturing mousemove and mouseup events.

  if (browser.isIE) {
    document.detachEvent("onmousemove", dragGo);
    document.detachEvent("onmouseup",   dragStop);
  }
  if (browser.isNS) {
    document.removeEventListener("mousemove", dragGo,   true);
    document.removeEventListener("mouseup",   dragStop, true);
  }
}

//]]></script>