[php] How to assign Php variable value to Javascript variable?

Possible Duplicate:
What's the best way to pass a PHP variable to Javascript?

I am using the following code:

<script type="text/javascript">
<?php $ctnme = $_SERVER['REQUEST_URI'];
$cnme = explode("/",$ctnme);
echo $cname = $cnme[1];
?>
var spge = <?php echo $cname; ?> ;
alert(spge);
</script>

The value doesn't alert. What is the mistake?

**var spge = '';** 
alert(spge);

Put quotes around the <?php echo $cname; ?> to make sure Javascript accepts it as a string, also consider escaping.

Use json_encode() if possible (PHP 5.2+).

See this one (maybe duplicate?): Pass a PHP string to a JavaScript variable (and escape newlines)

The most secure way (in terms of special character and data type handling) is using json_encode():

var spge = <?php echo json_encode($cname); ?>;