var js = 1.0;

Version = parseInt(navigator.appVersion);

if (navigator.appName == "Netscape")
    js = ((Version >= 4) ? 1.2 : ( (Version == 3) ? 1.1 : 1.0 ));
else
    if (navigator.appVersion.indexOf('MSIE') != -1) 
        js = ((Version >= 4) ? 1.1 : 1.0);

function changeImages(oldImage,newImage) {
    if (js > 1.0) document [oldImage].src = eval(newImage + ".src");
}

if (js > 1.0) {
    RFQ_mo = new Image();
    RFQ_mo.src  = "images/RFPbookMO.jpg";

    RFQ = new Image();
    RFQ.src  = "images/RFPbook.jpg";
}