Email validation using javascript

function validateEmail() { //name of email input field obj=document.getElementById(‘txtEmail’); msg=”Please enter valid email address”; var emailStr = /^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z] [a-zA-Z\.]*[a-zA-Z]$/; if (emailStr.test(obj.value) == false) { alert(msg); obj.focus(); obj.select(); return false; } return true; }