// JScript File
function IsEmail(obj)
{
    if(obj.value!="")
    {
        validRegExp = /^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/;
        strEmail = obj.value;
        if (strEmail.search(validRegExp) == -1)

            {
                alert(" A valid e-mail address is required.");
                obj.focus();
                return false;
            } 

    }
    return true;
}