// get the cute editor instance
var editor1 = document.getElementById('<%=Editor1.ClientID%>');
//Get the editor content
var editdoc=editor1.GetDocument();
// Get the editor HTML
editdoc.body.style.backgroundColor="red";
Please try the above code.
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asp.net wysiwyg editor: http://cutesoft.net/ASP.NET+WYSIWYG+Editor/default.aspx
asp wysiwyg html editor: http://cutesoft.net/ASP
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Live Support: http://cutesoft.net/live-support/default.aspx