var agt=navigator.userAgent.toLowerCase();
browsername=navigator.appName;
var browser=0;
var n=navigator.appName;
var v=parseInt(navigator.appVersion);
var v2='0';

if (agt.indexOf("msie 5.0")!=-1) {v2="5"};
if((n=="Netscape")&&(v>= 3))
 browser=1;
else if((n=="Microsoft Internet Explorer")&&(v= 4)&&(v2 != 5))
 browser=1;

if((document.images)&&(browser))
  {   
   blank = new Image(1,1);
   blank.src = "images/blank.gif";

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