var button = document.getElementById('addToCartButtonOne'); button.addEventListener( 'click', function() { fbq('track', 'Lead'); }, false ); var button = document.getElementById('addToCartButtonTwo'); button.addEventListener( 'click', function() { fbq('track', 'Lead'); }, false ); var button = document.getElementById('addToCartButtonThree'); button.addEventListener( 'click', function() { fbq('track', 'Lead'); }, false ); var button = document.getElementById('addToCartButtonFour'); button.addEventListener( 'click', function() { fbq('track', 'Lead'); }, false );