Using TinyMCE specify specific textarea elements to be turned in TinyMCE Html editors.
<!-- TinyMCE -->
<script type="text/javascript" src="/siteresources/js/tiny_mce/tiny_mce.js"></script>
<script type="text/javascript">
tinyMCE.init({
// General options
mode: "exact",
elements: "txtBody1",
theme: "advanced",
plugins: "pagebreak,style,layer,table,save,advhr,advimage,advlink,emotions,iespell,inlinepopups,insertdatetime,preview,media,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,visualchars,nonbreaking,xhtmlxtras,template,wordcount,advlist,autosave",
// Theme options
theme_advanced_buttons1: "iespell,|,bold,italic,underline,strikethrough,|,bullist,numlist,|,undo,redo,|,image,media,advhr,|,forecolor,backcolor",
theme_advanced_buttons2: "",
theme_advanced_buttons3: "",
theme_advanced_buttons4: "",
theme_advanced_toolbar_location: "top",
theme_advanced_toolbar_align: "left",
theme_advanced_statusbar_location: "bottom",
theme_advanced_resizing: true,
// Example content CSS (should be your site CSS)
content_css: "css/content.css",
// Drop lists for link/image/media/template dialogs
template_external_list_url: "lists/template_list.js",
external_link_list_url: "lists/link_list.js",
external_image_list_url: "lists/image_list.js",
media_external_list_url: "lists/media_list.js",
// Style formats
style_formats: [
{ title: 'Bold text', inline: 'b' },
{ title: 'Red text', inline: 'span', styles: { color: '#ff0000'} },
{ title: 'Red header', block: 'h1', styles: { color: '#ff0000'} },
{ title: 'Example 1', inline: 'span', classes: 'example1' },
{ title: 'Example 2', inline: 'span', classes: 'example2' },
{ title: 'Table styles' },
{ title: 'Table row 1', selector: 'tr', classes: 'tablerow1' }
]
});
</script>
<!-- /TinyMCE -->