var Drag = {
	enable : true,
	obj : null,

	init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
	{
		o.onmousedown	= Drag.start;

		o.hmode			= bSwapHorzRef ? false : true ;
		o.vmode			= bSwapVertRef ? false : true ;

		o.root = oRoot && oRoot != null ? oRoot : o ;

		if (o.hmode  && isNaN(parseInt(o.root.style.left  ))) o.root.style.left   = "0px";
		if (o.vmode  && isNaN(parseInt(o.root.style.top   ))) o.root.style.top    = "0px";
		if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right  = "0px";
		if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";

		o.minX	= typeof minX != 'undefined' ? minX : null;
		o.minY	= typeof minY != 'undefined' ? minY : null;
		o.maxX	= typeof maxX != 'undefined' ? maxX : null;
		o.maxY	= typeof maxY != 'undefined' ? maxY : null;

		o.xMapper = fXMapper ? fXMapper : null;
		o.yMapper = fYMapper ? fYMapper : null;

		o.root.onDragStart	= new Function();
		o.root.onDragEnd	= new Function();
		o.root.onDrag		= new Function();
	},
	
	start : function(e)
	{
		var o = Drag.obj = this;
		//o.className = "mapgrabbing";
		//o.style.cursor = "url('images/cursor/grab3.cur')";
		//o.style.cursor = "url(images/cursor/grab2.cur)";
		e = Drag.fixE(e);
		//Drag.obj.className = "mapgrabbing";
		if(ie)
		{
			if(	e.button != 1)	
				return;
		}
		else
		{
			if(	e.button != 0)	
				return;			
		}
		//var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
		var y = parseInt(o.root.offsetTop);
		var x = parseInt(o.root.offsetLeft);
		o.root.onDragStart(e, x, y);

		o.lastMouseX	= e.clientX;
		o.lastMouseY	= e.clientY;

		//if (o.hmode) {
			//if (o.minX != null)	o.minMouseX	= e.clientX - x + o.minX;
			//if (o.maxX != null)	o.maxMouseX	= o.minMouseX + o.maxX - o.minX;
		//} else {
		//	if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
		//	if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
		//}

		//if (o.vmode) {
			//if (o.minY != null)	o.minMouseY	= e.clientY - y + o.minY;
			//if (o.maxY != null)	o.maxMouseY	= o.minMouseY + o.maxY - o.minY;
		//} else {
		//	if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
		//	if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
		//}
		
		document.onmousemove	= Drag.drag;
		document.onmouseup		= Drag.end;
		
		return false;
	},

	drag : function(e)
	{
		//if(!Drag.enable)
			//return false;
		e = Drag.fixE(e);
		var o = Drag.obj;
		
		//Drag.obj.style.cursor = "url('images/cursor/grab2.cur')";
		var ey	= e.clientY;
		var ex	= e.clientX;
		//var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
		var y = parseInt(o.root.offsetTop);
		//var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
		var x = parseInt(o.root.offsetLeft);
		var nx, ny;

		/*if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
		if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
		if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
		if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);*/

		//nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
		nx = x + (ex - o.lastMouseX);
		ny = y + (ey - o.lastMouseY);

		/*if (o.xMapper)		nx = o.xMapper(y)
		else if (o.yMapper)	ny = o.yMapper(x)*/

		Drag.obj.root.style.left = nx + "px";
		Drag.obj.root.style.top = ny + "px";
		Drag.obj.lastMouseX	= ex;
		Drag.obj.lastMouseY	= ey;
		
		//if(nx%2 == 0)
		//	return false;
		//else
		//{
			Drag.obj.root.onDrag(e, nx, ny);
			//Drag.obj.className = "mapgrabbing";
			return false;
		//}
	},

	end : function()
	{
		//Drag.obj.style.cursor = "pointer";
		//Drag.obj.className = "map";
		//Drag.obj.style.cursor = "url('images/cursor/grab2.cur')";
		//Drag.obj.className = "map";
		document.onmousemove = null;
		document.onmouseup   = null;
		Drag.obj.root.onDragEnd(	parseInt(Drag.obj.root.style[Drag.obj.hmode ? "left" : "right"]), 
									parseInt(Drag.obj.root.style[Drag.obj.vmode ? "top" : "bottom"]));
		Drag.obj = null;
	},

	fixE : function(evt)
	{
		/*if (typeof e == 'undefined') e = window.event;
		if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
		if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
		return e;*/
		var e = evt ? evt : window.event;
		/*if (typeof(e.layerX) == 'undefined') e.layerX = e.offsetX;
		if (typeof(e.layerY) == 'undefined') e.layerY = e.offsetY;	*/
		
		//var src = ((ie)?e.srcElement:e.target);
		return e;			
	}
	/*,
	
	destruct : function()
	{
		this.onmousedown	= null;
		document.onmousemove	= Drag.empty;
		document.onmouseup		= Drag.empty;
	},
	empty : function()
	{
		return false;	
	}*/
};


var Drag2 = {

	obj : null,

	init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
	{
		o.onmousedown	= Drag2.start;

		o.hmode			= bSwapHorzRef ? false : true ;
		o.vmode			= bSwapVertRef ? false : true ;

		o.root = oRoot && oRoot != null ? oRoot : o ;

		if (o.hmode  && isNaN(parseInt(o.root.style.left  ))) o.root.style.left   = "0px";
		if (o.vmode  && isNaN(parseInt(o.root.style.top   ))) o.root.style.top    = "0px";
		if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right  = "0px";
		if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";
		//alert(minX);
		o.minX	= typeof minX != 'undefined' ? minX : null;
		o.minY	= typeof minY != 'undefined' ? minY : null;
		o.maxX	= typeof maxX != 'undefined' ? maxX : null;
		o.maxY	= typeof maxY != 'undefined' ? maxY : null;

		o.xMapper = fXMapper ? fXMapper : null;
		o.yMapper = fYMapper ? fYMapper : null;

		o.root.onDragStart	= new Function();
		o.root.onDragEnd	= new Function();
		o.root.onDrag		= new Function();
	},

	start : function(e)
	{
		
		var o = Drag2.obj = this;
		e = Drag2.fixE(e);
		var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
		var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
		o.root.onDragStart(e, x, y);

		o.lastMouseX	= e.clientX;
		o.lastMouseY	= e.clientY;

		if (o.hmode) {
			if (o.minX != null)	o.minMouseX	= e.clientX - x + o.minX;
			if (o.maxX != null)	o.maxMouseX	= o.minMouseX + o.maxX - o.minX;
		} else {
			if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
			if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
		}

		if (o.vmode) {
			if (o.minY != null)	o.minMouseY	= e.clientY - y + o.minY;
			if (o.maxY != null)	o.maxMouseY	= o.minMouseY + o.maxY - o.minY;
		} else {
			if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
			if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
		}

		document.onmousemove	= Drag2.drag;
		document.onmouseup		= Drag2.end;
		
		return false;
	},

	drag : function(e)
	{
		e = Drag2.fixE(e);
		var o = Drag2.obj;

		var ey	= e.clientY;
		var ex	= e.clientX;
		var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
		var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
		var nx, ny;
		
		if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
		if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
		if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
		if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);
		
		nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
		ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1));
		
		if (o.xMapper)		nx = o.xMapper(y)
		else if (o.yMapper)	ny = o.yMapper(x)

		Drag2.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
		Drag2.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
		Drag2.obj.lastMouseX	= ex;
		Drag2.obj.lastMouseY	= ey;

		Drag2.obj.root.onDrag(e, nx, ny);
		return false;
	},

	end : function()
	{
		document.onmousemove = null;
		document.onmouseup   = null;
		Drag2.obj.root.onDragEnd(	parseInt(Drag2.obj.root.style[Drag2.obj.hmode ? "left" : "right"]), 
									parseInt(Drag2.obj.root.style[Drag2.obj.vmode ? "top" : "bottom"]));
		Drag2.obj = null;
	},

	fixE : function(e)
	{
		if (typeof e == 'undefined') e = window.event;
		if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
		if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
		return e;
	}
};