var Drag = {
 obj : null,
 init : function(o,oRoot,minX,maxX,minY,maxY,bSwapHorzRef,bSwapVertRef,fXMapper,fYMapper){
		o.onmousedown	= Drag.start;
		o.onselectstart=function(){return false;}
		//oRoot.onmousedown = function(){this.style.zIndex = max_zIndex();}
        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;
		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){
		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));
		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(){
		document.onmousemove = null;
		Drag.obj.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;
	},
	keep : function(){
	var Boundaries = 15;//ÍϷű߽ç;
	ev = event || window.event;
	var mousePos = mouseCoords(ev);
    var objLeft = Drag.obj.root.offsetLeft;
	var objTop = Drag.obj.root.offsetTop;
	var objRight = document.body.clientWidth - (Drag.obj.root.offsetWidth + objLeft);
	var objBottom = document.body.clientHeight - (Drag.obj.root.offsetHeight + objTop);
	if(objLeft<Boundaries) Drag.obj.root.style.left = 0;
	if(objTop<Boundaries) Drag.obj.root.style.top = 0;
	if(objRight<Boundaries) Drag.obj.root.style.left = document.body.clientWidth - Drag.obj.root.offsetWidth;
	if(objBottom<Boundaries) Drag.obj.root.style.top = document.body.clientHeight - Drag.obj.root.offsetHeight;
	if(Drag.obj.root.id=='UserList'){
	 if(((objLeft<Boundaries&&objTop<Boundaries)||objLeft<Boundaries&&objBottom<Boundaries)||((objRight<Boundaries&&objTop<Boundaries)||(objRight<Boundaries&&objBottom<Boundaries))){
	 Drag.obj.root.style.height = document.body.clientHeight - 20;
	}else{
	  Drag.obj.root.style.height = 500;
	 }
	}
   }
};