function lib_bwcheck(){ 
   this.ver=navigator.appVersion
   this.agent=navigator.userAgent
   this.dom=document.getElementById?1:0
   this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0;
   return this
}
var bw=new lib_bwcheck()

if(bw.ie5){
 document.write ('<style type="text/css"> table{font-size : 100%; } #nav a{background: none;} #nav a:hover {background: none;} </style>');
}