Help Building Dynamic Checkboxes

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I am  having an issue with building dynamic checkboxes.. They appeared to be
working properly...but then all the checkboxes in the array are "checking"
ater the initial checkbox is selected.
I am building a sticky form to present the data. so anything checked in the
HTML would be dynamically checked in the PHP.

I am grateful to Jochem Maas for getting me to this point...

Any help is appreciated...

Here is the HTML...
<html>
<head>
<title>Dynamic Checkboxes</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body>
<form method="post" action="checkboxcalc.php">

<p><input name="gmev[]" type="checkbox" id="gmev" value="September
9th">September 9th</p>

<p><input name="gmev[]" type="checkbox" id="gmev" value="October
14th">October 14th</p>

<p><input name="gmev[]" type="checkbox" id="gmev" value="November
11th">November 11th</p

<p><input name="gmev[]" type="checkbox" id="gmev" value="December
9th">December 9th</p>

<input type="submit" name="Submit" value="Submit Registration">

</form>
</body>
</html>


Here is the PHP
<?

if ($gmev) {
$checked = ' checked="checked"';
} else {
$checked = '';
}

echo '<input name="gmev[]" type="checkbox" id="gmev"',$checked,'/>September
9th';

if ($gmev) {
$checked = ' checked="checked"';
} else {
$checked = '';
}

echo '<input name="gmev[]" type="checkbox" id="gmev"',$checked,'/>October
14th';

if ($gmev) {
$checked = ' checked="checked"';
} else {
$checked = '';
}

echo '<input name="gmev[]" type="checkbox" id="gmev"',$checked,'/>November
11th';

if ($gmev) {
$checked = ' checked="checked"';
} else {
$checked = '';
}

echo '<input name="gmev[]" type="checkbox" id="gmev"',$checked,'/>December
9th';

?>
thanks
zedleon

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