<!--

function getAppVersion() {
 appname= navigator.appName;
 appversion = navigator.appVersion;
 majorver = appversion.substring(0, 1);
 if ( (appname == "Netscape") && ( majorver >= 3 ) ) return 1;
 if ( (appname == "Microsoft Internet Explorer") && (majorver>= 4) ) return 1;
 return 0;
}

function rollovr(num, imgname) {
 if (getAppVersion()) {
  document[imgname].src = img[num].src;
 }
}

imgsrc = new Array();
imgsrc[0] = "images/nav_description_on.gif";
imgsrc[1] = "images/nav_description_off.gif";
imgsrc[2] = "images/nav_copyright_on.gif";
imgsrc[3] = "images/nav_copyright_off.gif";
imgsrc[4] = "images/nav_bio_on.gif";
imgsrc[5] = "images/nav_bio_off.gif";
imgsrc[6] = "images/nav_current_on.gif";
imgsrc[7] = "images/nav_current_off.gif";
imgsrc[8] = "images/nav_columnarchive_on.gif";
imgsrc[9] = "images/nav_columnarchive_off.gif";
imgsrc[10] = "images/nav_home_on.gif";
imgsrc[11] = "images/nav_home_off.gif";
imgsrc[12] = "images/nav_email_on.gif";
imgsrc[13] = "images/nav_email_off.gif";


if (getAppVersion()){
 img = new Array();
 for (i = 0; i < imgsrc.length; i++){
  img[i] = new Image();
  img[i].src = imgsrc[i];
 }
}

//-->