var browser = -1;

if (parseInt(navigator.appVersion) >= 3) { 
        browser = 1;
}

function hilite(imageName, imageState) {
   if (browser == 1) {
         srcSplit = document.getElementById(imageName).getAttribute("src").split("_");
         image = srcSplit[0] + "_" + imageState + "." + srcSplit[1].split(".")[1];
         document.getElementById(imageName).setAttribute ("src", image);

   }
}