function validate(form) { var unArray = ["admin", "George", "Sarah", "Michael"]; // as many as you like - no comma after final entry var pwArray = ["111", "Password2", "Password3", "Password4"]; // the corresponding passwords; for (var i=0; i <unArray.length; i++) { if ((form.un.value == unArray[i]) && (form.pw.value == pwArray[i])) { window.open("2 project.html"); } else { alert("Incorrect Username or Password"); } } }