PHP & javascript alert help?

Question

I am trying to call an alert which works fine, but I want it to show an alert if an age is higher than 30 or lower than 30, and show the age entered in the form, can this be done?

I have the follwing code i have done:
/calling yourdetails function to show details
if($details->Yourdetails($_POST['age'])){
$msg='blah, blah, blah.';
}
else
{
$msg=''blah, blah, blah.';
}
?>
Your age










javascript:
function alert1()
{
if( confirm("Continue?"))
{
document.object return= true;
}else{
document.object_return= false;
}
}

Answer 1

In your php have your if statement to call the alert code
echo "";