tinymce.js

function init() {
    tinyMCEPopup.resizeToInnerSize();
}

function escapeHtml(text) {
    return text.replace(/&/g, "&amp;").replace(/"/g, "&quot;").replace(/'/g, "'").replace(/</g, "&lt;").replace(/>/g, "&gt;");
}
function insertwpgcpcode() {

    var tagtext;
    var langname_ddb = document.getElementById('wpgcp_lang');
    var langname = langname_ddb.value;
    var linenumber = document.getElementById('wpgcp_linenumber').value;

    var html = escapeHtml(document.getElementById('wpgcp_code').value);

	if(langname_ddb=='123'){
		tagtext = '<pre class="prettyprint lang-'+ langname + ' linenums:' + linenumber + '" >' + html + '</pre>';
	}else{
		tagtext = '<pre>' + html + '</pre>';
	}
    
    window.tinymce.activeEditor.insertContent(tagtext);
    tinyMCEPopup.editor.execCommand('mceRepaint');
    tinyMCEPopup.close();
    return;
}