/*  js/dragV3.js    ***Really this is VERSION 4.01***

 FUNCTION: 	Version 3 OR 4 (this is version 4.01 good for Netscape 6)
MM_dragLayer must be installed by Dreamweaver 3 or 4***MM v. 3***

							all draggable layers should be named "Layer##" for ## is a numeral -- this allows tracking for no repeating of correct answers
							right() checks for completion of fill in.  assumes there is only one non-draggable layer and that all draggable fit somewhere. (otherwise
							correct by changing numDragable to the number of layers that do fit in... (numDragable really should be numSnappable...)
							wrong() alert: "this fits nowhere"
							off() resets status
							
			LayerFinished for a layer that will show on completion if there is no page to go to.

INPUT:		"page" is the web page to go to after completion; set this variable in the web page if there is one
					"msg" is the message to be displayed, don't define if there is none
					"numDragable"	see above...
					"finish" is a function be performed at finish if defined
EXAMPLE:	page="Tch2_3tFunc6.htm";msg="Good!";numDragable=3
*/
status=''
var numDragable // JH: the number of layers that can be snapped!!! (misnomer)
var currentLayer //JH addition to dragLayer

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_dragLayer(objName,x,hL,hT,hW,hH,toFront,dropBack,cU,cD,cL,cR,targL,targT,tol,dropJS,et,dragJS) { //v4.01
  //Copyright 1998 Macromedia, Inc. All rights reserved.
  var i,j,aLayer,retVal,curDrag=null,curLeft,curTop,IE=document.all,NS4=document.layers;
  var NS6=(!IE&&document.getElementById), NS=(NS4||NS6); if (!IE && !NS) return false;
  retVal = true; if(IE && event) event.returnValue = true;
  if (MM_dragLayer.arguments.length > 1) {
    curDrag = MM_findObj(objName); if (!curDrag) return false;
    if (!document.allLayers) { document.allLayers = new Array();
      with (document) if (NS4) { for (i=0; i<layers.length; i++) allLayers[i]=layers[i];
        for (i=0; i<allLayers.length; i++) if (allLayers[i].document && allLayers[i].document.layers)
          with (allLayers[i].document) for (j=0; j<layers.length; j++) allLayers[allLayers.length]=layers[j];
      } else {
        if (NS6) { var spns = getElementsByTagName("span"); var all = getElementsByTagName("div"); 
          for (i=0;i<spns.length;i++) if (spns[i].style&&spns[i].style.position) allLayers[allLayers.length]=spns[i];}
        for (i=0;i<all.length;i++) if (all[i].style&&all[i].style.position) allLayers[allLayers.length]=all[i]; 
    } }
    curDrag.MM_dragOk=true; curDrag.MM_targL=targL; curDrag.MM_targT=targT;
    curDrag.MM_tol=Math.pow(tol,2); curDrag.MM_hLeft=hL; curDrag.MM_hTop=hT;
    curDrag.MM_hWidth=hW; curDrag.MM_hHeight=hH; curDrag.MM_toFront=toFront;
    curDrag.MM_dropBack=dropBack; curDrag.MM_dropJS=dropJS;
    curDrag.MM_everyTime=et; curDrag.MM_dragJS=dragJS;
    curDrag.MM_oldZ = (NS4)?curDrag.zIndex:curDrag.style.zIndex;
    curLeft= (NS4)?curDrag.left:(NS6)?parseInt(curDrag.style.left):curDrag.style.pixelLeft; 
    if (String(curLeft)=="NaN") curLeft=0; curDrag.MM_startL = curLeft;
    curTop = (NS4)?curDrag.top:(NS6)?parseInt(curDrag.style.top):curDrag.style.pixelTop; 
    if (String(curTop)=="NaN") curTop=0; curDrag.MM_startT = curTop;
    curDrag.MM_bL=(cL<0)?null:curLeft-cL; curDrag.MM_bT=(cU<0)?null:curTop-cU;
    curDrag.MM_bR=(cR<0)?null:curLeft+cR; curDrag.MM_bB=(cD<0)?null:curTop+cD;
    curDrag.MM_LEFTRIGHT=0; curDrag.MM_UPDOWN=0; curDrag.MM_SNAPPED=false; //use in your JS!
    document.onmousedown = MM_dragLayer; document.onmouseup = MM_dragLayer;
    if (NS) document.captureEvents(Event.MOUSEDOWN|Event.MOUSEUP);
  } else {
    var theEvent = ((NS)?objName.type:event.type);
    if (theEvent == 'mousedown') {
      var mouseX = (NS)?objName.pageX : event.clientX + document.body.scrollLeft;
      var mouseY = (NS)?objName.pageY : event.clientY + document.body.scrollTop;
      var maxDragZ=null; document.MM_maxZ = 0;
      for (i=0; i<document.allLayers.length; i++) { aLayer = document.allLayers[i];
        var aLayerZ = (NS4)?aLayer.zIndex:parseInt(aLayer.style.zIndex);
        if (aLayerZ > document.MM_maxZ) document.MM_maxZ = aLayerZ;
        var isVisible = (((NS4)?aLayer.visibility:aLayer.style.visibility).indexOf('hid') == -1);
        if (aLayer.MM_dragOk != null && isVisible) with (aLayer) {
          var parentL=0; var parentT=0;
          if (NS6) { parentLayer = aLayer.parentNode;
            while (parentLayer != null && parentLayer.style.position) {             
              parentL += parseInt(parentLayer.offsetLeft); parentT += parseInt(parentLayer.offsetTop);
              parentLayer = parentLayer.parentNode;
          } } else if (IE) { parentLayer = aLayer.parentElement;       
            while (parentLayer != null && parentLayer.style.position) {
              parentL += parentLayer.offsetLeft; parentT += parentLayer.offsetTop;
              parentLayer = parentLayer.parentElement; } }
          var tmpX=mouseX-(((NS4)?pageX:((NS6)?parseInt(style.left):style.pixelLeft)+parentL)+MM_hLeft);
          var tmpY=mouseY-(((NS4)?pageY:((NS6)?parseInt(style.top):style.pixelTop) +parentT)+MM_hTop);
          if (String(tmpX)=="NaN") tmpX=0; if (String(tmpY)=="NaN") tmpY=0;
          var tmpW = MM_hWidth;  if (tmpW <= 0) tmpW += ((NS4)?clip.width :offsetWidth);
          var tmpH = MM_hHeight; if (tmpH <= 0) tmpH += ((NS4)?clip.height:offsetHeight);
          if ((0 <= tmpX && tmpX < tmpW && 0 <= tmpY && tmpY < tmpH) && (maxDragZ == null
              || maxDragZ <= aLayerZ)) { curDrag = aLayer; maxDragZ = aLayerZ; } } }
      if (curDrag) {
        		currentLayer = curDrag					 // JH adds
        document.onmousemove = MM_dragLayer; if (NS4) document.captureEvents(Event.MOUSEMOVE);
        curLeft = (NS4)?curDrag.left:(NS6)?parseInt(curDrag.style.left):curDrag.style.pixelLeft;
        curTop = (NS4)?curDrag.top:(NS6)?parseInt(curDrag.style.top):curDrag.style.pixelTop;
        if (String(curLeft)=="NaN") curLeft=0; if (String(curTop)=="NaN") curTop=0;
        MM_oldX = mouseX - curLeft; MM_oldY = mouseY - curTop;
        document.MM_curDrag = curDrag;  curDrag.MM_SNAPPED=false;
        if(curDrag.MM_toFront) {
          eval('curDrag.'+((NS4)?'':'style.')+'zIndex=document.MM_maxZ+1');
          if (!curDrag.MM_dropBack) document.MM_maxZ++; }
        retVal = false; if(!NS4&&!NS6) event.returnValue = false;
    } } else if (theEvent == 'mousemove') {
      if (document.MM_curDrag) with (document.MM_curDrag) {
        var mouseX = (NS)?objName.pageX : event.clientX + document.body.scrollLeft;
        var mouseY = (NS)?objName.pageY : event.clientY + document.body.scrollTop;
        newLeft = mouseX-MM_oldX; newTop  = mouseY-MM_oldY;
        if (MM_bL!=null) newLeft = Math.max(newLeft,MM_bL);
        if (MM_bR!=null) newLeft = Math.min(newLeft,MM_bR);
        if (MM_bT!=null) newTop  = Math.max(newTop ,MM_bT);
        if (MM_bB!=null) newTop  = Math.min(newTop ,MM_bB);
        MM_LEFTRIGHT = newLeft-MM_startL; MM_UPDOWN = newTop-MM_startT;
        if (NS4) {left = newLeft; top = newTop;}
        else if (NS6){style.left = newLeft; style.top = newTop;}
        else {style.pixelLeft = newLeft; style.pixelTop = newTop;}
        if (MM_dragJS) eval(MM_dragJS);
        retVal = false; if(!NS) event.returnValue = false;
    } } else if (theEvent == 'mouseup') {
      document.onmousemove = null;
      if (NS) document.releaseEvents(Event.MOUSEMOVE);
      if (NS) document.captureEvents(Event.MOUSEDOWN); //for mac NS
      if (document.MM_curDrag) with (document.MM_curDrag) {
        if (typeof MM_targL =='number' && typeof MM_targT == 'number' &&
            (Math.pow(MM_targL-((NS4)?left:(NS6)?parseInt(style.left):style.pixelLeft),2)+
             Math.pow(MM_targT-((NS4)?top:(NS6)?parseInt(style.top):style.pixelTop),2))<=MM_tol) {
          if (NS4) {left = MM_targL; top = MM_targT;}
          else if (NS6) {style.left = MM_targL; style.top = MM_targT;}
          else {style.pixelLeft = MM_targL; style.pixelTop = MM_targT;}
          MM_SNAPPED = true; MM_LEFTRIGHT = MM_startL-MM_targL; MM_UPDOWN = MM_startT-MM_targT; }
        if (MM_everyTime || MM_SNAPPED) eval(MM_dropJS);
        if(MM_dropBack) {if (NS4) zIndex = MM_oldZ; else style.zIndex = MM_oldZ;}
        retVal = false; if(!NS) event.returnValue = false; }
      document.MM_curDrag = null;
    }
    if (NS) document.routeEvent(objName);
  } return retVal;
}
function drag() {
window.status="dragging..."
}

function off() {
window.status=""
}
var count = 0; 
var track = new Array
function right() { 
	if ( numDragable == null ) numDragable = document.allLayers.length - 1
	var n = parseInt(currentLayer.id.substring(5))
  	if ( track[n]==null || isNaN(n)) { // makes sure this layer isn't snapped for the second time
  		count++
  		track[n] = true
		window.status="Correct, that\'s " + count + "."
		} 
	else window.status='Correct.'
	if (count >= numDragable) {  // makes sure the layers are still all snapped, c is the number snapped
		var c = 0
		for (i=0;i<document.allLayers.length;i++) {
			if (document.allLayers[i].MM_SNAPPED) c++
		}
		if ( c >= numDragable) {
 			if ( typeof(msg) == "string" ) alert(msg) //!= 'undefined'
			if (typeof MM_showHideLayers != 'undefined' && (typeof LayerFinished != 'undefined' || typeof document.getElementById('LayerFinished') != 'undefined') ){ //  bring results layer to the top
			MM_showHideLayers('LayerFinished','','show')
				if (document.getElementById) {
					obj = document.getElementById('LayerFinished')
					if (typeof obj == 'object')	obj.style.zIndex =1111
					}
				}
			if (typeof update == 'function') update()
			if (typeof finish == 'function') finish()
			if (typeof(page) == "string" && page != '' ) location=page
		}
	} 
}
function wrong() {
	alert('This one doesn\'t fit anywhere.')
}