网页右下角弹出提示框

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
   <title>JavaScript提示框</title>
   <script type="text/javascript">
   
   /**
   * 类名：CLASS_MSN_MESSAGE
   * 功能：提供类似MSN消息框
   * 示例：
   * var MSG = new CLASS_MSN_MESSAGE("aa",200,120,"短消息提示：","您有1封消息","今天请我吃饭哈");
   * MSG.show();
    * 消息构造
   */
   function CLASS_MSN_MESSAGE(id,width,height,caption,title,message,target,action){
      this.id       = id;
      this.title    = title;
      this.caption = caption;
      this.message = message;
      this.target   = target;
      this.action   = action;
      this.width    = width?width:200;
      this.height   = height?height:120;
      this.timeout = 150;
      this.speed    = 20;
      this.step     = 1;
      this.right    = screen.width -1;
      this.bottom   = screen.height;
      this.left     = this.right - this.width;
      this.top      = this.bottom - this.height;
      this.timer    = 0;
      this.pause    = false;
      this.close    = false;
      this.autoHide = true;
   }
 
   /**
   * 消息隐藏方法
   */
   CLASS_MSN_MESSAGE.prototype.hide = function(){
      if(this.onunload()){
          var offset = this.height>this.bottom-this.top?this.height:this.bottom-this.top;
          var me = this;
          if(this.timer>0){  
              window.clearInterval(me.timer);
          }
 
          var fun = function(){
              if(me.pause==false||me.close){
                  var x = me.left;
                  var y = 0;
                  var width = me.width;
                  var height = 0;
                  if(me.offset>0){
                      height = me.offset;
                  }
      
                  y = me.bottom - height;
                  if(y>=me.bottom){
                      window.clearInterval(me.timer);
                      me.Pop.hide();
                  } else {
                      me.offset = me.offset - me.step;
                  }
                  me.Pop.show(x,y,width,height);   
              }            
          }
          this.timer = window.setInterval(fun,this.speed)     
      }
   }
 
   /**
   * 消息卸载事件，可以重写
   */
   CLASS_MSN_MESSAGE.prototype.onunload = function() {
        return true;
   }
   /**
   * 消息命令事件，要实现自己的连接，请重写它
   */
   CLASS_MSN_MESSAGE.prototype.oncommand = function(){
        this.close = true;
        this.hide();
        window.open("http://www.lost63.com");
   }
   /**
   * 消息显示方法
   */
   CLASS_MSN_MESSAGE.prototype.show = function(){
        var oPopup = window.createPopup(); //IE5.5+
        this.Pop = oPopup;
 
        var w = this.width;
        var h = this.height;
 
        var str = "<div style='border-right: #455690 1px solid; border-top: #a6b4cf 1px solid; z-index: 99999; left: 0px; border-left: #a6b4cf 1px solid; width: " + w + "px; border-bottom: #455690 1px solid; position: absolute; top: 0px; height: " + h + "px; background-color: #c9d3f3'>"
          str += "<table style='border-top: #ffffff 1px solid; border-left: #ffffff 1px solid' cellspacing=0 cellpadding=0 width='100%' bgcolor=#cfdef4 border=0>"
          
          str += "<tr>"
          str += "<td style='font-size: 12px;color: #0f2c8c' width=30 height=24></td>"
          str += "<td style='padding-left: 4px; font-weight: normal; font-size: 12px; color: #1f336b; padding-top: 4px' valign=center width='100%'>" + this.caption + "</td>"
          str += "</tr>"
          str += "<tr>"
          /*height：设置里面内容区域的高度 */
          str += "<td style='padding-right: 1px;padding-bottom: 1px' colspan=3 height=" + (h-50) + ">"
          str += "<div style='border-right: #b9c9ef 1px solid; padding-right: 8px; border-top: #728eb8 1px solid; padding-left: 8px; font-size: 12px; padding-bottom: 8px; border-left: #728eb8 1px solid; width: 100%; color: #1f336b; padding-top: 8px; border-bottom: #b9c9ef 1px solid; height: 100%'>" + this.title + "<br><br>"
          str += "<div style='word-break: break-all' align=left><font color=#ff0000>" + this.message + "</font></div>"
          str += "</div>"
          str += "</td>"
          str += "</tr>"
          str += "<tr align=center>"
          str += "<td colspan=3>"
          str += "<div style='padding: 2 0 2 0;'>"
          str += "<span id='buttonClose'><input type='button' title=关闭 value=确认 style='width:60px; height:20px; border-right: #002D96 1px solid; padding-right: 2px; border-top: #002D96 1px solid; padding-left: 2px; FONT-SIZE: 12px; filter: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#FFFFFF, EndColorStr=#9DBCEA); border-left: #002D96 1px solid; CURSOR: hand; color: black; padding-top: 2px; border-bottom: #002D96 1px solid;'></span>"
          str += "</div>"
          str += "</td>"
          str += "</tr>"
          str += "</table>"
          str += "</div>"

        oPopup.document.body.innerHTML = str;
        this.offset = 0;
        var me = this;
 
        oPopup.document.body.onmouseover = function(){me.pause=true;}
        oPopup.document.body.onmouseout = function(){me.pause=true;}
 
        var fun = function(){
            var x = me.left;
            var y = 0;
            var width      = me.width;
            var height     = me.height;
 
                if(me.offset>me.height){
                    height = me.height;
                } else {
                    height = me.offset;
                }
 
            y = me.bottom - me.offset;
            if(y<=me.top){
                //me.timeout--;
                if(me.timeout==0){
                    window.clearInterval(me.timer);
                    if(me.autoHide){
                        me.hide();
                    }
                }
            } else {
                me.offset = me.offset + me.step;
            }
            me.Pop.show(x,y,width,height);  
        }
 
        this.timer = window.setInterval(fun,this.speed)     
  
    //"确认"关闭事件
  
        var buttonClose = oPopup.document.getElementById("buttonClose");
        buttonClose.onclick = function(){
            me.close = true;
            me.hide();
        }
   }
   /*
   * 设置速度方法
   */
   CLASS_MSN_MESSAGE.prototype.speed = function(s){
      var t = 20;
      try {
          t = praseInt(s);
      } catch(e){}
      this.speed = t;
   }
   /**
   * 设置步长方法
   */
   CLASS_MSN_MESSAGE.prototype.step = function(s){
      var t = 1;
      try {
          t = praseInt(s);
      } catch(e){}
      this.step = t;
   }
 
   CLASS_MSN_MESSAGE.prototype.rect = function(left,right,top,bottom){
      try {
          this.left        = left    !=null?left:this.right-this.width;
          this.right        = right    !=null?right:this.left +this.width;
          this.bottom        = bottom!=null?(bottom>screen.height?screen.height:bottom):screen.height;
          this.top        = top    !=null?top:this.bottom - this.height;
      } catch(e){}
   }
  
  
   var MSG1 = new CLASS_MSN_MESSAGE("aa",240,150,"管理员：","思路决定出路","迷失路上");
      MSG1.rect(null,null,null,screen.height-50);
      MSG1.speed    = 10;
      MSG1.step    = 5;

   
   /**
   * 显示提示框
   */
   function showMSG(){
    MSG1.show();
   }
  
   </script>
</head>

<body>

   <input type="button" value="按钮" onclick="showMSG(); ">
   <br>
   <hr>

</body>
</html>