Changing HTML attributes

Hi,
My application can display HTML pages in a JTextPane. It can highlight parts of the text to make them stand out. But this is a problem when the HTML document has the same color that is used for highlighting the text. It makes the text look invisible!
So I would like to be able to change the background color to white, no matter what is in the original HTML document. (Later, I will also be wanting to change the font color to black, and maybe remove/change some other attributes, but one thing at a time!)
A StyledDocument is created with this code: EditorKit ek = new HTMLEditorKit();
StyledDocument myDoc = (StyledDocument)ek.createDefaultDocument(); The HTML from the file is then read into myDoc with the "Read" method of the EditorKit. This StyledDocument will be used in another class which displays it on the JTextPane. But I want to change it BEFORE it goes on the JTextPane.
Because the JTextPane accesses myDoc, I made a temporary StyledDocument called tempDoc to read the HTML into, then **hopefully** make my changes to, so that the very last line can be myDoc = tempDoc to make sure that myDoc only gets the very final changes.
I use a Javax.Swing.Text.ElementIterator over the StyledDocument to get all of the elements and see if it's the body element using the Element.getName() method. This part works, because I have lots of println's in to see what is happening.
I then use a SimpleAttributeSet and construct it using (bodyElement.getAttributes()). Then I tell it this: SimpleAttributeSet sas = new SimpleAttributeSet(bodyElement.getAttributes());
sas.removeAttribute(sas.getAttribute(HTML.Attribute.BGCOLOR));
sas.addAttribute(HTML.Attribute.BGCOLOR, "white");
tempDoc.setCharacterAttributes(0, tempDoc.getLength(), sas, true); For the last line in particular, I feel like I've tried everytthing! Many different combinations.
What I notice happening is that often the HTML document in the JTextPane displays the original document. Or else, all of the Elements, including content, are replaced with the <body bgcolor=white"> tag. (I make the EditorKit write out the resulting HTML file to see what's going on!). In the JTextPane, the original bgcolor remains, even if the content disappears. In the Browser, the bgcolor is the right color (with the content still missing.)
Please do not tell me to edit the HTML files themselves as they are the client's, and it's a nicer solution for the program to handle them rather than tell the people to manually edit all of the files. Plus, the files are machine-generated, so there might not be anyone who even knows HTML!
I have also tried using StyleConstants to change the colors, but this only changes the colors right behind the text. So the bgcolor is still displayed, but it looks like someone has run a white highlighter over the text. Quite ugly!
I hope I have explained this well. The code is quite complicated (and messed up right now because I have been playing with it all day) so I haven't posted it. If you have any questions to clarify it, please ask!
Thanks in advance to anyone who takes a look and attempts to help. (There are Dukes cuz everyone seems to like them, even though I don't really know what they do. A ranking system?)

Ok, I deleted all of my changes and started again. This time, I set the Paragraph attributes instead of Character Attributes (I read the API properly and it said that set Character Attributes changes all of the content element attributes). That would explain why all of the text disappeared, lol! It doesn't explain why the original document was still being displayed in the JTextPane, but when I set Paragraph attributes, the document with the correct color background appears.
There are still a couple of funny things happening. Cuz I'm lazy I'll post the resulting and original HTML files here:
ORIGINAL:
<html>
<head>
<title>A Test Document</title>
</head>
<body bgcolor=red>
A red document

New paragraph
</body>
</html>
RESULTING:
<html>
<head>
<body bgcolor="white">
<title>A Test Document </title>
</body>
</head>
<body bgcolor="red">
<body bgcolor="white">
A red document
</body>
<body bgcolor="white">
New paragraph
</body>
</body>
</html>
It would be nice if only the <body bgcolor=red> tag would be replaced with <body bgcolor="white"> instead of getting inserted everywhere (even in the HEAD tag). I tried setting the Paragraph attributes to bodyElement.getStartOffset and getEndOffset() but it didn't work either.

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import java.awt.event.*;
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ex.printStackTrace();
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setVisible(true);
public static void main(String a[]) {
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