Validation code problem

I have a piece of code that validates whether one button has been selected from a bunch of dynamically created radio buttons.

[code]
//Validation Code

var checked = false;
var Sizes = document.BuyProduct.Sizes;

for (var i=0; i<Sizes.length; i++)
{
if (Sizes[i].checked) {
checked = true;
}
}

if(!checked)
{
Errors++
document.getElementById(‘mySpan1a’).style.display=’block’;
document.getElementById(‘mySpan1a’).innerHTML=’Please Select a Size!’;
document.getElementById(‘mySpan1b’).style.display=’inline’;
document.getElementById(‘mySpan1b’).innerHTML=’! ‘;
}
else
{
document.getElementById(‘mySpan1a’).style.display=’none’;
document.getElementById(‘mySpan1a’).innerHTML=”;
document.getElementById(‘mySpan1b’).style.display=’none’;
document.getElementById(‘mySpan1b’).innerHTML=”;
}

// Form code

<?php echo $Err1?><span class=”mySpan1b” id=”mySpan1b”></span><span class=”head4″>Available Sizes:</span><span class=”errmsg”> *</span>
<table style=”position:relative;”><tr>

<?php

$counter=0;
$X=0;
$i=0;
$IsEmpty1 == false;

while ($IsEmpty1 == false)
{
if($AvailableSizes[$X] != “”)
{
$id1 = “Size”.$i;
if($counter%6==0&&$counter!=0) echo “</tr><tr>”;
echo”<td>$AvailableSizes[$X]</td>”;
echo “<td><label><input type=’radio’ id=’$id1′ name=’Sizes’ value=’$AvailableSizes[$X]'”;
if($AvailableSizes[$X] == $SizeSel){echo “Checked”;} echo”></label></td></tr><tr>”;
++$counter;
}
else
{
$IsEmpty1 = true;
}
$i++;
$X++;
}
?>
</tr></table>
[/code]

The validation code works, but to a point. This code assumes that there will be more than 1 radio button to choose from and becomes an array, however occassionally there will be only a single button which doesn’t turn the selection into an array, and thus stops the validation code from working and displaying the error message for that option.

So what I need is a modified version of the validation that can account for when the selection is an array and when it is only a single option as well.

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