} function nextPrev(n) { // This function will figure out which tab to display var x = document.getElementsByClassName("tab"); // Exit the function if any field in the current tab is invalid: if (n == 1 && !validateForm()) return false; // Hide the current tab: x[currentTab].style.display = "none"; // Increase or decrease the current tab by 1: currentTab = currentTab + n; // if you have reached the end of the form... if (currentTab >= x.length) { // ... the form gets submitted: document.getElementById("regForm").submit(); return false; } // Otherwise, display the correct tab: showTab(currentTab); } function validateForm() { // This function deals with validation of the form fields var x, y, i, valid = true; x = document.getElementsByClassName("tab");