function check_form() { 
    
	if (document.add.email.value == "") 
	{ 
		alert('Check E-mail Address'); 
		document.add.email.focus(); 
		return false; 
	} 
	if (document.add.email.value.length > 0 && !document.add.email.value.match( /^.+@.+$/ ) ) {
	    alert("check your Email");
		document.add.email.focus();
		return false;
	}
    if (document.add.content.value == "") { 
      alert('Content can not empty'); 
      document.add.content.focus(); 
      return false; 
    } 
  }