We don't suggest you access the DOM in editor iframe directly. Here is a sample code if you want to do it.

<script type='text/javascript'>
var globaleditor=null;

function editor_document_onmouseover(e)
{
	if(!e)e=globaleditor.GetWindow().event;
	var domnode=e.target||e.srcElement;
	var rtenode=globaleditor.GetNodeFromDom(domnode);
	if(rtenode)rtenode.SetRuntimeAttribute("style","text-decoration:underline","mybehavior");
}
function editor_document_onmouseout(e)
{
	if(!e)e=globaleditor.GetWindow().event;
	var domnode=e.target||e.srcElement;
	var rtenode=globaleditor.GetNodeFromDom(domnode);
	if(rtenode)rtenode.SetRuntimeAttribute("style",null,"mybehavior");
}

function AttachEditorEvent(editor)
{
	var win=editor.GetWindow();
	var doc=win.document;
	if(doc.addEventListener)
	{
		doc.addEventListener("mouseover",editor_document_onmouseover,false);
		doc.addEventListener("mouseout",editor_document_onmouseout,false);
	}
	else
	{
		doc.attachEvent("onmouseover",editor_document_onmouseover);
		doc.attachEvent("onmouseout",editor_document_onmouseout);
	}
}
function DetachEditorEvent(editor)
{
	var win=editor.GetWindow();
	var doc=win.document;
	if(doc.removeEventListener)
	{
		doc.removeEventListener("mouseover",editor_document_onmouseover,false);
		doc.removeEventListener("mouseout",editor_document_onmouseout,false);
	}
	else
	{
		doc.detachEvent("onmouseover",editor_document_onmouseover);
		doc.detachEvent("onmouseout",editor_document_onmouseout);
	}
}
function RichTextEditor_OnLoad(editor)
{
	globaleditor=editor;
	
	AttachEditorEvent(editor);
	
	editor.AttachEvent("InitEvent",function(argeditor,argevent)
	{
		AttachEditorEvent(editor);
	});
	editor.AttachEvent("UninitEvent",function(argeditor,argevent)
	{
		DetachEditorEvent(editor);
	});
}
</script>

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