I do not understand why this does not work, getHTML works fine.

I have a page with the ID 'messagediv' which contains text when the page is first loaded. All I am trying to do is copy this text into the editor. When CuteEditorPopulate is called I receive the error "ce.SetHTML is not a function."

DHFContent.prototype.CuteEditorPopulate = function()
{
    var md = document.getElementById('messagediv');
    var ce = document.getElementById('<%=cew.ClientID%>');
 
    if(ce&&md)
    {
        ce.SetHTML(md.innerHTML);
    }
}

Does anybody know why this code is not working?