I can't figure out why it's not working. I have a page that calls another page through an xmlhttp request, and I need it to pull a variable AND it's value. This is the code for the page that I need the variable to go to.

Code:
function openLockdownPage() 
{
	var xmlhttp;
	var lockdownCheck = "<?php echo $lockdownValue ?>";
	console.debug(lockdownCheck);
	// Code for IE7+, FireFox, Chrome, Opera, Safari
	if (window.XMLHttpRequest)
	{
		xmlhttp = new XMLHttpRequest();
	}
			
	//code for IE6, IE5
	else
	{
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	xmlhttp.onreadystatechange = function()
	{
		if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
		{
			if (lockdownCheck == 1)
			{
				document.all[0].innerHTML = xmlhttp.responseText;
			}
		}	
	}
	
	xmlhttp.open("GET", "<?php echo HTML_ROOT_PATH ?>modules/dynamic-display/overrides/lockdown/lockdownCheck.php?"+lockdownValue,true);
	xmlhttp.send();

}
And then I call it in PHP like this:

Code:
$lockdownValue = isset($_GET['lockdownCheck']) ? isset($_GET['lockdownCheck']) : "The value cannot be found";
And then this is the code that pulls the variable from the database, and if the variable's value is set to 1, it replaces the innerHTML with another page.

Code:
<?php
	include("../../../../config.php");
	include("../../../../db.php");
	//Query Overrides table
	$query = "SELECT * FROM Overrides";
	$result = mysql_query($query) or die (mysql_error());

	//Check lockdown status
	$lockdownStatus = mysql_fetch_array($result);

	if ($lockdownStatus['active'] == 1)
	{
		echo '<body onload = "openLockdownPage();">';
	}
?>

<script type = "text/javascript">
function openLockdownPage()
{
	var lockdownValue = "<?php echo $lockdownStatus['active'] ?>";
	var xmlhttp;
	// Code for IE7+, FireFox, Chrome, Opera
	if (window.XMLHttpRequest)
	{
		xmlhttp = new XMLHttpRequest();
	}

	// Code for IE6, IE5
	else
	{
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	}

	xmlhttp.onreadystatechange = function()
	{
		if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
		{
			if (lockdownValue == 1)
			{
				document.all[0].innerHTML = xmlhttp.responseText;
			}
		}
	}

	xmlhttp.open("GET", "../lockdown/lockdown.php",true);
	xmlhttp.send();
}
</script>
I'd be grateful for any sort of help on this, I've been working at this for a long time, and it's starting to bug me.