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:334; 
    this.height = height?height:248; 
    this.timeout= 300; 
    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;
} 

/*
*    隐藏消息方法 
*/ 
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.google.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='Z-INDEX: 99999; LEFT: 0px;WIDTH: " + w + "px;POSITION: absolute; TOP: 0px; HEIGHT: " + h + "px;>" 
        str += "<TABLE style='BORDER-TOP: #ffffff 1px solid; BORDER-LEFT: #ffffff 1px solid' cellSpacing=1 cellPadding=1 width='100%' border=1>" 
        str += "<TR>" 
        str += "<TD style='PADDING-RIGHT: 2px; PADDING-TOP: 2px' vAlign=center align=right width=19>" 
        str += "<SPAN title=关闭 style='FONT-WEIGHT: bold; FONT-SIZE: 12px; CURSOR: hand; COLOR: red; MARGIN-RIGHT: 4px' id='btSysClose' >×</SPAN></TD>" 
        str += "</TR>" 
        str += "<TR>" 
        str += "<TD style='PADDING-RIGHT: 1px;PADDING-BOTTOM: 1px'  height=" + (h-28) + ">" 
        str += "<DIV style=' FONT-SIZE: 12px; WIDTH: 100%;PADDING-TOP: 8px; HEIGHT: 100%'>" + this.title + "<BR><BR>" 
        str += "<DIV style='WORD-BREAK: break-all' align=left><A href='javascript:void(0)' hidefocus=false id='btCommand'><FONT color=#ff0000>" + this.message + "</FONT></A><A href='http:' hidefocus=false id='ommand'></A></DIV>" 
        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=false;}
    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)      
    var btClose = oPopup.document.getElementById("btSysClose"); 
    btClose.onclick = function(){ 
        me.close = true;
        me.hide(); 
    } 

    var btCommand = oPopup.document.getElementById("btCommand"); 
    btCommand.onclick = function(){ 
        me.oncommand(); 
    }    
var ommand = oPopup.document.getElementById("ommand"); 
      ommand.onclick = function(){ 
       //this.close = true;
    me.hide(); 
window.open(ommand.href);
    }   
} 
/**//* 
** 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){} 
} 
function showme(){
var MSG1 = new CLASS_MSN_MESSAGE("aa",240,165,"","<img src='images/ad/ad.jpg' width='240' height='157'>",""); 
    MSG1.rect(null,null,null,screen.height-50); 
    MSG1.speed    = 20; 
    MSG1.step    = 5; 
    MSG1.show(); 
	}
setTimeout(showme,6000);