Javascript Validation by karan chanana

               JavascriptValidation

function validate(form_id,email) {

   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

   var address = document.forms[form_id].elements[email].value;

   if(reg.test(address) == false) {

      alert('Invalid Email Address');

      return false;

   }

}

<form id="form_id" method="post" action="action.php" onsubmit="javascript:return validate('form_id','email');">

   <input type="text" id="email" name="email" />

   <input type="submit" value="Submit" />

</form>