Top Posters during XXXX

[Bane]

I am using a php file to display the top ten posters:

PHP Code:

<?php 

require("global.php"); 

$db_link = @mysql_pconnect("$dbservername", "$dbusername", "$dbpassword"); 
mysql_select_db("$dbname"); 

?> 

<table cellpadding="4" cellspacing="1" width="100%"> 
<tr> 
<td><small><strong>TOP POSTERS</strong></small></td> 
<td align="center"><small><strong>POSTS</strong></small></td> 
</tr> 
<?php 
$top_post = top_posters(); 
while( $row = mysql_fetch_row($top_post) ) 
{ 
print('<tr>'); 
print('<td>'); 
print('<a href="member.php?s=&action=getinfo&userid='); 
print($row[0]); 
print('" target="_top">'); 
print($row[1]); 
print('</a></td>'); 
print('<td align="center">'); 
print($row[2]); 
print('</td>'); 
print('</tr>'); 
} 
mysql_free_result ($top_post); 
?> 
</table> 

<?php 

function top_posters() 
{ 
$cur_time = mktime(date(G), date(i), date(s), date(m), date(d), date(Y)); 
$query = 'SELECT userid, username, posts ' . 
'FROM user ' . 
'ORDER BY posts DESC LIMIT 3'; 
$result = mysql_query($query) 
or die('top_posters query failed'); 
return($result); 
} 

?>

IRC may recognise this

My question is, is there a way to set this so it displays the top posters of the last 7 days and the number of posts during that time period?

I had tried changing some things and got the top list for last 7 days, but it would only display the total number of posts, not just for those 7 days..

I hope Im making sense.