Problem with escaping - "

The problem is that, every time I submit every " is preceeded by \
for example:

<p><span class=\"Title\">Znowu</span></p>

or

<p><font size=\"5\" color=\"#ff0000\">Test</font></p>

In source during edition, there is no problem:

<p><font size="5" color="#ff0000">Test</font></p>

everything is ok, but after submitting $_POST looks like:

Array
(
    [content] => <p><font size=\"5\" color=\"#ff0000\">Test</font></p>
)

What can I do to get off slash \ ?