<script type="text/javascript">  
//by uScripts.Ru Ruslan Sadykhov  
createopis = function () {  
var f = document.createElement('iframe');//через фрейм даже проще  
f.src = '/load/0-0-0-$ID$-13';  
f.style.border = 0;  
f.style.width = 0;  
f.style.height = 0;  
f.id = 'editFr';  
f.onload = getValFramea;  
document.body.appendChild(f);  
}  
getValFramea = function () {  
var valu = document.getElementById('editFr').contentWindow.document.getElementById('brief').value;  
new _uWnd('frmVal', 'Описание ', 300, 200, {oncontent:function(){document.getElementById('frmNowVal').value = valu;}},'<fieldset><legend>Описание </legend><div align="left"><textarea width:="" 100%;="" rows="8" id="frmNowVal" cols="55"></textarea></div><div align="left"><input type="button" value="Редактировать описание" onclick="changeVala()"></div></fieldset>');  
}  
changeVala = function () {  
var val = document.getElementById('frmNowVal').value;  
document.getElementById('editFr').contentWindow.document.getElementById('brief').value = val;  
document.getElementById('editFr').contentWindow.document.getElementById('addEntForm').submit();  
_uWnd.close('frmVal');  
}  
</script>

<a href="javascript:createopis()">Редактировать описание</a>