var mID=null, mPosX=0, mPosY=0;
var drag = 
{	obj:null,
		tms:null,
		ogg:null,
		oldX:null,
		oldY:null,
		vx:null,
		vy:null,
		xx:null,
		yy:null,
		frz:0.86,
		
	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)
	{
		clearTimeout(tm1);
		 
		var o = drag.obj = this;
		
			drag.ogg = o.root;
			clearInterval(drag.tms);
				
		e = drag.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(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)
	{
		 clearTimeout(tm1);
			 
		e = drag.fixE(e);
		var o = drag.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));

			drag.xx = nx;
			drag.yy = ny;
			drag.vx = drag.xx - drag.oldX;
			drag.vy = drag.yy - drag.oldY;
			drag.oldX = drag.xx;
			drag.oldY = drag.yy;		
		
		if(o.xMapper) nx = o.xMapper(y)
		else if(o.yMapper) ny = o.yMapper(x)

		drag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
		drag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
		drag.obj.lastMouseX	= ex;
		drag.obj.lastMouseY	= ey;
		
		drag.obj.root.ondrag(nx, ny);
		return false;
	},

	end:function()
	{
		 if(drag.obj.id.indexOf('mcart') > -1)
		 {
			 ystart = drag.obj.lastMouseY+document.body.scrollTop;
			 myXOffs = drag.obj.lastMouseX;
			 myYOffs = drag.obj.lastMouseY;
			 // limits
			 if(myYOffs < 0) myYOffs = 10;
			 if(myYOffs > (screen.height-150)) myYOffs = screen.height-150;
			 YScrll();
			 //initscrll();
		 }
		 else  drag.lancio();
		 
		 // new pos tbl (refresh tbls)
		 mPosX = drag.obj.style.left;
		 mPosY = drag.obj.style.top;
		 
		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(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;
	},
		
	lancio:function()
	{
		//document.title = drag.ogg.id
		
		drag.vx *= drag.frz;
		drag.vy *= drag.frz;
		drag.xx += drag.vx;
		drag.yy += drag.vy;
			
		drag.ogg.style.left = drag.xx;
		drag.ogg.style.top  = drag.yy;
		
		drag.tms = setTimeout("drag.lancio()",10);
	}
};