Nesting Javascript Within PHP Statements

[Anon]

Working on an event calendar which lists only dates entered by the client to be viewed on their site. Following code verifies that the client entry from a drop-down is a valid date ( i.e. No FEB 30th ).
If invalid - substitutes current date...
Is it possible to nest Javascript in this code which would produce an alert box, rather than this current-date substitution ?
Thanks in Advance.......

if ( ! checkdate( $MM, 1, $YY ) )
{
$nowArray = getdate();
$MM = $nowArray[mon];
$DD = $nowArray[mday];
$YY = $nowArray[year];
$start = mktime ( 0, 0, 0, $MM, $DD, $YY );
$calendardate = getdate($start);
}

[Anon]

I'm not shure, but something like this in your PHP-code could (or should?) do the trick:

echo "<script> alert('Uh Oh...'); </script>";

[nicki]

I don't think it works- I just posted a question about this. if you put javascript within a php variable, it doesn't seem to parse as javascript.
$var="<script> ...whatever the code is</script>";

print "$var";

that won't error but it won't print form elements or do any javascript. as far as i can tell.