dw_scrollObjs = {};
dw_scrollObj.speed = 100; // default speed for mouseover scrolling
tab_speed = 0; //Tiempo de movimiento con TAB.

function dw_scrollObj(wnId, lyrId, cntId)
{ 
	this.id = wnId;
	dw_scrollObjs[this.id] = this;
  	this.animString = "dw_scrollObjs." + this.id;
  	this.load(lyrId, cntId);
}

dw_scrollObj.loadLayer = function(wnId, id, cntId)
{
	if ( dw_scrollObjs[wnId] ) dw_scrollObjs[wnId].load(id, cntId);
}

dw_scrollObj.prototype.load = function(lyrId, cntId)
{ 
	if (!document.getElementById) return;
  	var wndo, lyr;
  	if (this.lyrId)
  	{
  		lyr = document.getElementById(this.lyrId);
    	lyr.style.visibility = "hidden";
  	}
  	lyr = document.getElementById(lyrId);
 	wndo = document.getElementById(this.id);
  	lyr.style.top = this.y = 0;
  	lyr.style.left = this.x = 0;
  	this.maxY = (lyr.offsetHeight - wndo.offsetHeight > 0)? lyr.offsetHeight - wndo.offsetHeight: 0;
  	this.wd = cntId? document.getElementById(cntId).offsetWidth: lyr.offsetWidth;
  	this.maxX = (this.wd - wndo.offsetWidth > 0)? this.wd - wndo.offsetWidth: 0;
  	this.lyrId = lyrId; // hold id of currently visible layer
  	lyr.style.visibility = "visible";
  	this.on_load(); 
  	this.ready = true;
}

dw_scrollObj.prototype.on_load = function() {}

dw_scrollObj.prototype.shiftTo = function(lyr, x, y)
{ 
	lyr.style.left = (this.x = x) + "px";
  	lyr.style.top = (this.y = y) + "px";
}

// remove layers from table for ns6+/mozilla (needed for scrolling inside tables)
dw_scrollObj.GeckoTableBugFix = function()
{ 
	var i, wndo, holderId, holder, x, y;
	if ( navigator.userAgent.indexOf("Gecko") > -1 && navigator.userAgent.indexOf("Firefox") == -1 )
	{
		dw_scrollObj.hold = []; // holds id's of wndo and its container
    	for (i=0; arguments[i]; i++)
    	{
    		if ( dw_scrollObjs[ arguments[i] ] )
      		{
      			wndo = document.getElementById( arguments[i] );
        		holderId = wndo.parentNode.id;
        		holder = document.getElementById(holderId);
        		document.body.appendChild( holder.removeChild(wndo) );
        		wndo.style.zIndex = 1000;
        		x = holder.offsetLeft;
        		y = holder.offsetTop;
        		wndo.style.left = x + "px";
        		wndo.style.top = y + "px";
        		dw_scrollObj.hold[i] = [ arguments[i], holderId ];
      		}
    	}
   		window.addEventListener("resize", dw_scrollObj.rePositionGecko, true);
  	}
}

// ns6+/mozilla need to reposition layers onresize when scrolling inside tables.
dw_scrollObj.rePositionGecko = function()
{ 
	var i, wndo, holder, x, y;
  	if (dw_scrollObj.hold) 
  	{
    	for (i=0; dw_scrollObj.hold[i]; i++)
    	{
    		wndo = document.getElementById( dw_scrollObj.hold[i][0] );
      		holder = document.getElementById( dw_scrollObj.hold[i][1] );
      		x = holder.offsetLeft; 
      		y = holder.offsetTop;
      		wndo.style.left = x + "px";
      		wndo.style.top = y + "px";
    	}
  	}
}

// Controlamos la tecla TAB.
function keyDown(evt)
{
	if (evt && evt.which) //NS
	{ 
		thisKey = evt.which;
		tab_speed = 700;
	}
	else if(window.event && window.event.keyCode) //IE
	{
		thisKey = window.event.keyCode;
		tab_speed = 500;
	}
	if (thisKey == 9) 
	{
		if (tab) dw_scrollObj.initScroll('WN','Down','','tab');
    }
}
 
// Controlamos la rueda del ratón.
function wheel(event)
{
     if (!event) event = window.event; // For IE
	     var delta = 0;
     if (event.wheelDelta)             // IE case
          delta = event.wheelDelta;
     else if (event.detail)            // Mozilla case
          delta = -event.detail;       // Mozilla and IE deltas differ in sign
     if (delta)
          delta = delta<0?-1:+1;
     if (delta) {
          if (delta>0)
          {
            dw_scrollObj.initScroll('WN','Up','','wheel');		// Code for rolling down
          }
          else
          {
            dw_scrollObj.initScroll('WN','Down','','wheel');	// ...and Up
          }
     }
}

// Capturamos la rueda del ratón.
if (window.addEventListener) window.addEventListener('DOMMouseScroll', wheel, false); /* For mozilla. */
window.onmousewheel = document.onmousewheel = wheel;

window.onkeydown = document.onkeydown = keyDown;
if (document.layers) window.captureEvents(Event.KEYDOWN|Event.KEYUP);