function checkAndSend()
  {
    var is_name = document.getElementById('name').value;
    var is_email = document.getElementById('email').value;
    var is_idea = document.getElementById('idea').value;
  
    if( is_name == "" )
    {
      alert( "Name is required" );
      return;
    }
  
    if( is_email == "" )
    {
      alert( "Email is required" );
      return;
    }
    
    if( is_idea == "" )
    {
      alert( "Idea is required" );
      return;
    }

    var reg_exp = /[A-Za-z0-9\-_]+@[A-Za-z0-9\-\_]+\.[A-Za-z0-9\-]+/;
    if( !reg_exp.test(is_email) )
    {
      alert( 'wrong email' );
      return;
    }

    document.getElementById("postform").submit();
  }