//*****************************************************************************
// Do not remove this notice.
//
// Copyright 2001 by Mike Hall.
// See http://www.brainjar.com for terms of use.
//*****************************************************************************

// 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;
  }
}


function getAbsoluteLeft(objectId) {
	// Get an object left position from the upper left viewport corner
	// Tested with relative and nested objects
	o = document.getElementById(objectId)
	oLeft = o.offsetLeft            // Get left position from the parent object
	while(o.offsetParent!=null) {   // Parse the parent hierarchy up to the document element
		oParent = o.offsetParent    // Get parent object reference
		oLeft += oParent.offsetLeft // Add parent left position
		o = oParent
	}
	// Return left postion
	return oLeft
}

function getAbsoluteTop(objectId) {
	// Get an object top position from the upper left viewport corner
	// Tested with relative and nested objects
	o = document.getElementById(objectId)
	oTop = o.offsetTop            // Get top position from the parent object
	while(o.offsetParent!=null) { // Parse the parent hierarchy up to the document element
		oParent = o.offsetParent  // Get parent object reference
		oTop += oParent.offsetTop // Add parent top position
		o = oParent
	}
	// Return top position
	return oTop
}

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;

  dragObj.elNode = document.getElementById(id);
	
  // 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;
	
//GET DIV POSITION!!!
  dragObj.elStartLeft  = parseInt(dragObj.elNode.style.left, 10);
  dragObj.elStartTop   = parseInt(dragObj.elNode.style.top,  10);

  if (isNaN(dragObj.elStartLeft)) dragObj.elStartLeft = getAbsoluteLeft(id);
	//los 70 vienen del margin en la css
  if (isNaN(dragObj.elStartTop))  dragObj.elStartTop  = getAbsoluteTop(id) + 70;
	

  // 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);
  }
}