I have tried to echo the button, however the link just does not work, so I thinks something is wrong with the href link, please help.
echo "<input class='button_normal' type='button' value='entertainment' onclick='window.location..href=<Electronic and Entertainment Products.php>'>";
@james_91 The code below should do the trick:
<?php
echo "<input class=\"button_normal\" type=\"button\" value=\"entertainment\" onclick=\"window.location.href='Electronic and Entertainment Products.php'\">";
?>
I would advise against using spaces in your file names so use underscores instead maybe.
JS within a button within PHP works best with escaped quotation marks, you also had two dots in between location and href as commented by Fred -ii-