help with php code plz

If i have this code in single-post.php

$tube= “abcdefghi”
$sub2 = substr ( $tube ,5);
echo “$sub2” ;
?>
<script type=”text/javascript”>
var flashvars = {};
flashvars.v = “.$sub2.”; ….. </script>

this return .$sub2. in my source page…
how i can return the value of $sub2 like below 🙁

$tube= “abcdefghi”
$sub2 = substr ( $tube ,5);
echo “$sub2” ;
?>
<script type=”text/javascript”>
var flashvars = {};
flashvars.v = “fghi”; ….. </script>

Thanks in advance