// Determine browser and version.
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;


  }

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

  s = "Gecko";
  if ((i = ua.indexOf(s)) >= 0)
   {
   		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;
  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) {
	  
  // Clear the drag element global.
  dragObj.elNode = null;
  // 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);


  }


}

function hideWindow(id)
{

	var wnd=document.getElementById(id);
	wnd.style.visibility='hidden';
	}
	
function showWindow(id)
{
	var wnd=document.getElementById(id);
	wnd.style.visibility='visible';
}