function getCookie(name) {
            var dc = document.cookie;
            var prefix = name + "=";
            var begin = dc.indexOf("; " + prefix);
            if (begin == -1) {
                begin = dc.indexOf(prefix);
                if (begin != 0) return null;
            } else {
                begin += 2;
            }
            var end = document.cookie.indexOf(";", begin);
            if (end == -1) end = dc.length;
            return unescape(dc.substring(begin + prefix.length, end));
        }
        function initFontsize() {
            value = getCookie("fontsize");
            if (!value) {
                version = navigator.appVersion;
                if (version.toLowerCase().indexOf("mac")!=-1) {
                    value = "0.85";
                } else {
                    value = "0.8";
                }
            }
            var idelement = document.getElementsByTagName("body")[0];
            idelement.style.fontSize = value + "em";
        }

        function clearField (thisfield, placeholder) {
            if (thisfield.value == placeholder) { thisfield.value = ''}
        }
        value = getCookie("sheet");
        if (value == "blackwhite") {
            document.write("<link rel='stylesheet' type='text/css' media='screen' href='/blackwhite.css' />");
        }
        if (value == "yellowblack") {
            document.write("<link rel='stylesheet' type='text/css' media='screen' href='/yellowblack.css' />");
        }
        if (value == "yellowblue") {
            document.write("<link rel='stylesheet' type='text/css' media='screen' href='/yellowblue.css' />");
        }
        if (value == "standard") {
            document.write("<link rel='stylesheet' type='text/css' media='screen' href='/standard.css' />");
        }