Ok, I tried following but none of them worked.
<?
$_ENV['SCRIPT_URL']
print "$url"; ?>
I also tried following but that didn't work as well
<?
$url = $_GET[$_ENV['SCRIPT_URL']];
print "$url"; ?>
I also tried following which also didn't work.
<? $_ENV['SCRIPT_URL'] ?>
I am not much familier with php but sometime do things while playing with it. I can't make this thing happen. If someone can tell me the complete code to put in the web page then it will be great help.