bName=navigator.appName;  bVer=parseInt(navigator.appVersion);
 if(bName=="Netscape" && bVer >= 3) version="n3";
 else if (bName=="Microsoft Internet Explorer" && bVer>=4) version="n3";
 else version="n2";
 var darkened_pics = new Array(); var lighted_pics = new Array();
 function preloadButtonSet(num,dark,light){  if(version=="n3") {
   darkened_pics[num] = new Image();  darkened_pics[num].src = dark;
   lighted_pics[num] = new Image(); lighted_pics[num].src = light; } }
 preloadButtonSet(0,"images/b-home-off.jpg",      "images/b-home-on.jpg");
 preloadButtonSet(1,"images/b-about-off.jpg",     "images/b-about-on.jpg");
 preloadButtonSet(2,"images/b-whatsftz-off.jpg",  "images/b-whatsftz-on.jpg");
 preloadButtonSet(5,"images/b-benefits-off.jpg",  "images/b-benefits-on.jpg");
 preloadButtonSet(9,"images/b-bios-off.jpg",      "images/b-bios-on.jpg");
 preloadButtonSet(3,"images/b-analysis-off.jpg",  "images/b-analysis-on.jpg");
 preloadButtonSet(4,"images/b-history-off.jpg",   "images/b-history-on.jpg");
 preloadButtonSet(5,"images/b-benefits-off.jpg",  "images/b-benefits-on.jpg");
 preloadButtonSet(6,"images/b-press-off.jpg",     "images/b-press-on.jpg");
 preloadButtonSet(7,"images/b-sitemap-off.jpg",   "images/b-sitemap-on.jpg");
 preloadButtonSet(8,"images/b-links-off.jpg",     "images/b-links-on.jpg");
 preloadButtonSet(10,"images/b-glossary-off.jpg", "images/b-glossary-on.jpg");
 preloadButtonSet(11,"images/b-resources-off.jpg","images/b-resources-on.jpg");
 preloadButtonSet(12,"images/b-press-off.jpg",    "images/b-press-on.jpg");
 preloadButtonSet(13,"images/b-tips-off.jpg",     "images/b-tips-on.jpg");
 function lighten(num) { if(version=="n3") {if (document.images)
   eval("document.button"+num+".src = lighted_pics["+num+"].src;");
   return false; } }
 function darken(num) { if(version=="n3") { if (document.images)
   eval("document.button"+num+".src = darkened_pics["+num+"].src;");
   return false; } }