Problem with execCommand function

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Javascript

HTML

Firefox

I have a content editable DIV that plays the role of a rich text box.

<div id='myRichTextBox' contenteditable='true'>
</div>

I need to insert some images to this text box, I used function execCommand, Like this:

document.execCommand("insertImage", false, imgLink);

Once this function executed, It insert an element <img src="imgLink"> to the text box.
But as we know a single tag in a standard HTML code must be either in the two following formats:
1. Start with <TagName> and ends with </TagName>
2. Be in format <TagName some attribute />

My problem is the inserted image element by the function execCommand is not in a standard format, And my XML parser fails with this HTML code.
How I can standard this HTML code? Please give me a solution.

Thanks in advance
abforce