var Drag=
{
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;
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;
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;

}

}
;