what would cause this?

what would cause my submissions on a news form to be resubmitted if i refresh the page?
ie. i add an article, and refresh the page(fields are now blank) but it adds a copy of what i previously submitted.

how do i prevent this?

??? whats the code you are using?? there must be some sort of switch in your code, that is being running when you refresh the page.

Sounds like he is using (hoping for a lucky guess) $_SERVER['PHP_SELF'] as the form to. Flush it with a header()....

if ($Submit)
{
mysql_connect('localhost','*****','****");
// login into the mysql database server
mysql_select_db('essenmin_myDb');
// select the site's database

if(empty($title) || empty($text)) exit("You didn't completely fill in the form!");
mysql_query("INSERT INTO news (title,text,date) VALUES ('$title','$text', 'now()')");
?>
<table width=75% border=1>
<tr><td>Title<td>Date<td>News
<?
$query = mysql_query('SELECT * FROM news');
while($news = mysql_fetch_array($query))
{
echo "<tr><td>" . $news['title'] . "<td>" . $news['date'] . "<td>" . $news['text'];
}
//echo "</table>";
unset($Submit); //attempts to fix...
echo "Submit: " . $submit; //attempt to fix...
}
?>
<form method=get action=<?=$PHP_SELF?>>
Title:<br>
<input type=text name=title size=30>
<br>
News Article:<br>
<textarea name=text rows=4 cols=30 Wrap=hard></textarea>
<br>
<input type=submit name=Submit value=submit>
</form>
<? exit() ?>