js右下角弹出提示消息框代码(提示未读消息数)

<script language=javascript>
<!--
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;
}
 
/*
*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.jb200.com");

}
/**//*
*消息显示方法
*/ 右下角提示框效果
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 += "<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' colspan=3 height=" + (h-28) + ">"
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><a href='javascript:void(0)' hidefocus=false id='btcommand'><font color=#ff0000>" + this.message + "</font></a><a href='http:' hidefocus=false id='ommand'><font color=#ff0000>新兴网络提示</font></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){}
}
var msg1 = new class_msn_message("aa",210,126,"消息提示：","您有1封未读消息","今天你请我吃？");
msg1.rect(null,null,null,screen.height-50);
msg1.speed= 10;
msg1.step= 5;
msg1.show();
</script>