how i can print javascript code in php echo

how i can print javascript code in php echo

I want use javascript code in php for echo and when i use this code in
echo for print then javascript new window not work, the code is working
fine in html but not work in php echo when i print this code in php
<a onclick="NewWindow(this.href,'mywin','350','240','no','center');return
false" onfocus="this.blur()" class="a" href="attachFile.php?id=<?php echo
$id;?>">Attach File</a>