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:320;  
    this.height = height?height:264;  
    this.timeout= 1500;  
    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();  
} 
/**//*  
*    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='background:url(images/bg01.gif) no-repeat; Z-INDEX: 99999; LEFT: 0px; WIDTH:200; POSITION: absolute; TOP: 0px; HEIGHT:156px;'>"  
        str += "<TABLE cellSpacing=0 cellPadding=0 width='100%' border=0>"  
        str += "<TR>"
        str += "<TD width=200 height=24 style='FONT-WEIGHT: normal; FONT-SIZE: 12px; COLOR: #333333; font-family:arial' vAlign=center width=300>　" + this.caption + "</TD>"  
        str += "<TD vAlign=center align=center width=20>"
        str += "<SPAN title=关闭 style='FONT-WEIGHT: bold; FONT-SIZE: 12px; CURSOR: hand; COLOR: #666666;' id='btSysClose' >×</SPAN></TD>"
        str += "</TR>"
        str += "<TR align=left valign=top>"
        str += "<TD style='overflow:hidden;' colSpan=2 height=216>"
        str += "<DIV style='margin:0px; padding:0px;overflow:hidden;'>"
        str += "<img src='images/4.jpg' width='200' height='156' />"
				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){} 
} 
var MSG1 = new CLASS_MSN_MESSAGE("aa",200,156,"鲁班故里特产有限公司","","");
    MSG1.rect(null,null,null,screen.height-50); 
    MSG1.speed    = 10; 
    MSG1.step    = 5; 
    //alert(MSG1.top); 
    MSG1.show();