<style type="text/css">
#informationbar{  
position: fixed;  
left: 0;  
width: 100%;  
text-indent: 5px;  
padding: 5px 0;  
background-color: lightyellow; /*цвет фона*/  
border-bottom: 1px solid black; /*толщина и цвет рамки*/  
font: bold 12px Verdana;  
}
* html #informationbar{ /*IE6 hack*/  
position: absolute;  
width: expression(document.compatMode=="CSS1Compat"? document.documentElement.clientWidth+"px" : body.clientWidth+"px");  
}
</style>
<script type="text/javascript">  
function informationbar(){  
this.displayfreq="always"  
this.content='<a href="javascript:informationbar.close()"><img src="close.gif" style="width: 14px; height: 14px; float: right; border: 0; margin-right: 5px" /></a>'  
}
informationbar.prototype.setContent=function(data){  
this.content=this.content+data  
document.write('<div id="informationbar" style="top: -500px">'+this.content+'</div>')  
}
informationbar.prototype.animatetoview=function(){  
var barinstance=this  
if (parseInt(this.barref.style.top)<0){  
this.barref.style.top=parseInt(this.barref.style.top)+5+"px"  
setTimeout(function(){barinstance.animatetoview()}, 50)  
}  
else{  
if (document.all && !window.XMLHttpRequest)  
this.barref.style.setExpression("top", 'document.compatMode=="CSS1Compat"? document.documentElement.scrollTop+"px" : body.scrollTop+"px"')  
else  
this.barref.style.top=0  
}  
}
informationbar.close=function(){  
document.getElementById("informationbar").style.display="none"  
if (this.displayfreq=="session")  
document.cookie="infobarshown=1;path=/"  
}
informationbar.prototype.setfrequency=function(type){  
this.displayfreq=type  
}
informationbar.prototype.initialize=function(){  
if (this.displayfreq=="session" && document.cookie.indexOf("infobarshown")==-1 || this.displayfreq=="always"){  
this.barref=document.getElementById("informationbar")  
this.barheight=parseInt(this.barref.offsetHeight)  
this.barref.style.top=this.barheight*(-1)+"px"  
this.animatetoview()  
}  
}
window.onunload=function(){  
this.barref=null  
}
</script>
<script type="text/javascript">  
<!--Invocation code-->
var infobar=new informationbar()  
infobar.setContent('Текст вашего сообщения будет тут <a href="http://infoscript.ru">А тут будет ссылка</a>')  
//infobar.setfrequency('session') //Uncomment this line to set information bar to only display once per browser session!  
infobar.initialize()
</script>