gistfile1.js

            String.prototype.escape = function() {
                return this.replace(/&/gm, '&amp;').replace(/</gm, '&lt;').replace(/>/gm, '&gt;');
            }

            function doIt() {
                var viewDiv = document.getElementById("highlight-view");
                var t1 = document.getElementById("t1");
                var t2 = document.getElementById("t2");
                var selector = document.getElementById("langSelector");
                var selectedLang = selector.options[selector.selectedIndex].value.toLowerCase();
                if(selectedLang) {
                    viewDiv.innerHTML = '<pre><code class="'+selectedLang+'">'+t1.value.escape()+"</code></pre>";
                } else { // try auto
                    viewDiv.innerHTML = '<pre><code>' + t1.value.escape() + "</code></pre>";
                }
                hljs.highlightBlock(viewDiv.firstChild.firstChild);
                t2.value = viewDiv.innerHTML;
            }

            function copyToBuffer(textToCopy) {
                if (window.clipboardData) { // IE
                    window.clipboardData.setData("Text", textToCopy);
                } else if (window.netscape) { // FF
                    // from http://developer.mozilla.org/en/docs/Using_the_Clipboard
                    netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
                    var gClipboardHelper = Components.classes["@mozilla.org/widget/clipboardhelper;1"].getService(Components.interfaces.nsIClipboardHelper);
                    gClipboardHelper.copyString(textToCopy);
                }
            }