TinyEditor — визуальный редактор на JavaScript

var input = document.getElementById("input").value;

var val = window.frames[0].document.getElementById("editor").innerHTML

 document.getElementsByTagName("iframe").item(0).contentWindow.document.body.innerHTML

function test() {
var text = prompt('Введите текст блока');
 
// и вот тут как то занести в окошко редактора 
'<div class="test">'+text+'</div>';
 
}

TINY.editor=function(){
    var c=[], offset=-30;
    c['cut']=[1,'Cut','a','cut',1];
    c['copy']=[2,'Copy','a','copy',1];
    c['paste']=[3,'Paste','a','paste',1];
    c['bold']=[4,'Bold','a','bold'];
    c['italic']=[5,'Italic','a','italic'];
    c['underline']=[6,'Underline','a','underline'];
    c['strikethrough']=[7,'Strikethrough','a','strikethrough'];
    c['subscript']=[8,'Subscript','a','subscript'];
    c['superscript']=[9,'Superscript','a','superscript'];
    c['orderedlist']=[10,'Insert Ordered List','a','insertorderedlist'];
    c['unorderedlist']=[11,'Insert Unordered List','a','insertunorderedlist'];
    c['outdent']=[12,'Outdent','a','outdent'];
    c['indent']=[13,'Indent','a','indent'];
    c['leftalign']=[14,'Left Align','a','justifyleft'];
    c['centeralign']=[15,'Center Align','a','justifycenter'];
    c['rightalign']=[16,'Right Align','a','justifyright'];
    c['blockjustify']=[17,'Block Justify','a','justifyfull'];
    c['undo']=[18,'Undo','a','undo'];
    c['redo']=[19,'Redo','a','redo'];
    c['image']=[20,'Insert Image','i','insertimage','Enter Image URL:','http://'];
    c['hr']=[21,'Insert Horizontal Rule','a','inserthorizontalrule'];
    c['link']=[22,'Insert Hyperlink','i','createlink','Enter URL:','http://'];
    c['unlink']=[23,'Remove Hyperlink','a','unlink'];
    c['unformat']=[24,'Remove Formatting','a','removeformat'];
    c['print']=[25,'Print','a','print'];
 
//..