Change border of image on onClick

[Tenaciousmug]

I am trying to add a border around the base they select and then when they select another one, I want the previous one to go away and then high light that one.
This is my PHP code that outputs the bases:

$gender = $_GET['gender'];
// SQL Injection here?
$sql = "SELECT * FROM habases WHERE gender='".$gender."'";
$result = mysqli_query($cxn, $sql) or die(mysqli_error($cxn));
$baseCount = 0;
while ($row = mysqli_fetch_assoc($result))
{
	$baseimage = $row['image'];
                                                                                    
	$basesOutput .= "<input type=\"image\" id=\"".$baseCount."\" src=\"http://www.elvonica.com/".$baseimage."\" onclick=\"baseBorder(".$baseCount.");return false;\" value=\"".$baseimage."\" name=\"base\">";
	$baseCount++;
}

I have a baseCount so each image ID is unique. The baseBorder() is the function that will change the border.

Here is the baseBorder() function:

var prevId;
function baseBorder(count)
{
	if (prevId)
	{
		$("#prevId").style.border="none";
	}
	else
	{
		$("#count").style.border="2px solid #E8272C";
		prevId = count;
	}
}

Can anyone help me out since it's not working?

[Tenaciousmug]

Ok sorry got it to work. Just can't get the unhighlight and highlight the other one now.
Here is my code:

var prevId;
function baseBorder(count)
{
	if (prevId)
	{
		document.getElementById(count).style.border="none";
	}
	else
	{
		document.getElementById(count).style.border="2px solid #E8272C";
		prevId = count;
	}
}