function isValidEmail(emailId) 
{
    if (emailId.toLowerCase().search(/^[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]$/) != -1)
        return true;
    else
        return false;
}