在网页里做类似window右键的弹出式菜单

做一个类似于window右键的弹出式菜单。

代码如下： 

var obj;

function loadobj(o)
{
  obj=o;
}

function expand()
{
  var h=parseInt(obj.height);
  var w=parseInt(obj.width);
  var op=10;

  if( h<=170 )
  {
    if( w<60 )
      obj.style.width=w+6;

    obj.style.height=h+17;

    x=setTimeout('expand()', 25);
  }
  else
  {
    obj.style.width=60;
    obj.style.height=174;
    clearTimeout(x);
  }
}

var drag=0;
var move=0;
function Dblclick()
{
  if (event.button==0)
    {
      obj.style.visibility="visible";
      obj.style.left=window.event.x;
      obj.style.top =window.event.y;
      obj.style.width=0;
      obj.style.height=0;

      obj.filters.item(0).apply();
      obj.filters.item(0).transition = 25;
      obj.filters(0).play(0.5);

      expand();
    }
}

function MouseMove()
{
  if(move==1)
    {
      obj.style.cursor="move";
      obj.style.left=window.event.x-l;
      obj.style.top=window.event.y-t;
    }
}

function MouseDown()
{
  if(drag) 
    {
      l = window.event.x - parseInt(obj.style.left);
      t = window.event.y - parseInt(obj.style.top);
      obj.style.zIndex+=1;
      move=1;
    }
  else
    {
      document.body.style.cursor='default';
      obj.style.visibility='hidden';
    }
}

function MouseStop()
{
  window.event.returnValue=false;
}

function MouseUp()
{
  move=0;
  obj.style.cursor="hand";
}

document.ondblclick=Dblclick;
document.onmousedown=MouseDown;
document.onmousemove=MouseMove;
document.ondragstart=MouseStop;
document.onmouseup=MouseUp;