Multiple Email Validation using Jquery

Simple Jquery Validation for Sending Multiple Email:

After creating a form with submit button,Call the jquery function in that submit button while Onclicking,
Use this submit button code, if your submit button with image,

$form['send'] = array(
         '#type' => 'image_button',
         '#src' => path_to_theme() . "/images/btn_0_0_send_off.gif",
         '#attributes' => array('onclick' => "validateEmailForm(); return false;", 'onMouseOver'=>"this.src=Drupal.settings.basePath + 'your image path/btn_0_0_send_ro.gif';",'onMouseOut'=>"this.src=Drupal.settings.basePath + 'your image path/btn_0_0_send_off.gif';" ),
    );

Now we are validating that Multiple email field,assume that the field id is"edit-mailid",..

$(function () {

    validateEmailForm = function(){           

        var mailid  = $('#edit-mailid').val();
/* Your Mail address Validation */
        if(mailid  == ''){
            errorCount = 1;
            error+="<li>You must supply a value for the 'mailid' field of this form.</li>";
        }
        else {
            var result = mailid  .split(",");
            for(var i = 0;i < result.length;i++)
                if(!validate_email(result[i])) {
                    errorCount = 1;
                    error+="<li>Please enter a valid email address</li>";
                }
        }
}
});

/**
 * Function for validating Multiple email
 */

function validate_email(email)
{
    var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

     if (!filter.test(email))
           {
             return false;
           }
           else
           {
               return true;
           }

}