Cross Browser Compatibility Issue resolve -- 2

My website is built in PHP, JOOMLA, SQL, Javascript All the features are WORKING FINE in google chrome however, in Internet Explorer and Safari the buttons seem to bring the visitor back to the FRONT PAGE instead of going forward. There is some Javascript compatibility issue on cross browsers in desktop and mobile view. Please contact me if you're experienced in cross-browser compatibility knowing PHP, JOOMLA, SQL, Javascript etc to sort these out. Thanks and regards