function fnInit() {
    var whichLayer = "extrainfo";
    if (document.getElementById(whichLayer)) {
        // this is the way the standards work
        var style2 = document.getElementById(whichLayer).style;
        style2.display = "none";
    }
    else if (document.all) {
        if (document.all[whichLayer]) {
            // this is the way old msie versions work
            var style2 = document.all[whichLayer].style;
            style2.display = "none";
        }
    }
    else if (document.layers) {
        if (document.all[whichLayer]) {
            // this is the way nn4 works
            var style2 = document.layers[whichLayer].style;
            style2.display = "none";
        }
    }
}