Retreive/Store if checkbox i checked

[the_mossman]

I have a db that stores id and size for checked checkboxes. (Only checked checkboxes i stored in this db)

I want to generate checkboxes until $i<(a specified number).

If the value of the checkbox that is about to be created is already stored in the db, then make the checkbox that is created CHECKED.

 

IN SHORT:

Create the checkboxes with the value that are not stored in the DB unchecked.

If the checkbox value is stored in the DB, create the checkbox checked.

 

$query = "SELECT * FROM db WHERE fileid=$fileid";
$result = mysql_query($query,$db_link);
$rows = mysql_num_rows($result);

$a = 4.5; //Value of the first checkbox generated

echo "<form method =\"post\" action=\"sizes.php\">";
	for ($i=0; $i<20; $i++){
		$a = $a + 0.5; //size is increased by 0.5 for each checkbox
		for($x=0; $x<$rows; $x++) {
		$size = mysql_result($result,$x,"size"); //size is retreived from db where fileid=$fileid
			if ($a == $size) {  //Here I want to say: if there is a value in db, display teh box as checked
				echo "<input name=\"sizes[]\" type=\"checkbox\" value=\"$a\" checked=\"checked\" />$a   ";		
				$a = $a + 0.5;
			}
		}
			echo "<input name=\"sizes[]\" type=\"checkbox\" value=\"$a\" />$a   "; //every box that is not checked

	}
echo "<input type=\"hidden\" name=\"fileid\" value=\"$fileid\">";
echo "<input type=\"submit\" name=\"submit\" value=\"Ok\" style=\"width: 
echo "</form>";

$submit = $_POST['submit'];
if ($submit == "Ok"){
$mySizes = $_POST['sizes'];
$fileid = $_POST['fileid'];
	$query = "DELETE FROM greppet_sizes WHERE fileid='$fileid'";
	mysql_query($query,$db_link);

if ($mySizes != null){
	foreach ($mySizes as $value){
		$query = "INSERT INTO greppet_sizes VALUES (null,$fileid,'$value')";
		mysql_query($query,$db_link);
	}
}
}
100px;\" />