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

function savedrag(){
	// opslaan nieuwe locatie van dragged element
	
}

function resetdrag(){
	// dragduplicate verwijderen en displaystyle van original resetten

	
}

function setdrag(){
	
	
	
}

function initdrag(){
	
	// activeren drag
	draginit = 1;
	
	// opslaan relevante data
	dragID = '';
	dragtype = '';
	dragsource = '';
	
	// body attributes aanpassen
	if (browser.isIE){
		document.body.onmousemove = '';
	}
	else {
		document.body.setAttribute('onmousemove','');
	}
	
	// uitstellen activering drag
	setTimeout('onsetdrag()', 500);
	
}

function canceldrag(){
	
	// deactiveren drag
	draginit = 0;
	
	// body attributes aanpassen
	if (browser.isIE){
		document.body.onmousemove = '';
	}
	else {
		document.body.removeAttribute('onmousemove');
	}
	
}

function onsetdrag(){
	// per drag deze dingen 1x doen
	
	// checken of drag nog actief is
	if (draginit == 0){ return false; }
	
	// opbouwen coordinaten db
	getdropareas();
	
	// eventuele openstaande windows dicht gooien
	for (var i = 0; i < activewindows.length; i++){
		
		if (activewindows[i][0] >= dragID){
			
			document.getElementById(activewindows[i][2]).parentNode.removeChild(document.getElementById(activewindows[i][2]));
			
		}
		
	}
	
}

function findPos(obj){
	// vind top en left coordinates
	
	var curleft = curtop = 0;
	
	if (obj.offsetParent){
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
		
	}
	return [curleft,curtop];
}

function getdropareas(){
	// checken welke dropcoordinaten dragelement heeft
	
	// elementen met name droparea ophalen
	var dropelements = getelements('droparea');
	
	// dropareas[#][0/1/2/3] = top/left/width/height
	var dropareas = new Array();
	
	for (var i = 0; i < dropelements.length; i++){
		
		var dimensions;
		dimensions = Element.getDimensions(dropelements[i]);
		
		var locations;
		locations = findPos(dropelements[i]);
		
		dropareas[i] = new Array(4);
		dropareas[i][0] = locations[1];
		dropareas[i][1] = locations[0];
		dropareas[i][2] = dimensions.width;
		dropareas[i][3] = dimensions.height;
		
	}
}

function onreleasedrag(){
	
	
	
}

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)){
	  var cur = findPos(dragObj.elNode);
	  dragObj.elStartLeft = cur[0];
	  dragObj.elStartTop = cur[1];
  }
  
  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 findPos(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft
		curtop = obj.offsetTop
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft
			curtop += obj.offsetTop
		}
	}
	return [curleft,curtop];
}

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.

  var newleft = dragObj.elStartLeft + x - dragObj.cursorStartX;
  var newtop = dragObj.elStartTop  + y - dragObj.cursorStartY;
  
  if (newleft < 0){ newleft = 0; }
  if (newtop < 0){ newtop = 0; }
  
  dragObj.elNode.style.left =  newleft + "px";
  dragObj.elNode.style.top  =  newtop + "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);
  }
}