function chkads(){
  if(myform.book_content.value.length<10){
  alert("请描述您的需求!"); //Please fill out the form!
  myform.book_content.value="";
  myform.book_content.focus();
  return false;
}

  if(myform.book_user.value.length<2){
  alert("称呼不能为空!"); //Please fill out the form!
  return false;
  }
  else if(myform.book_user.value=="称呼"){
  alert("请输入您的称呼!");
  myform.book_user.value="";
  myform.book_user.focus();
  return false;
}

 var phone = document.getElementById('book_tel').value;
    if(!(/^1(3|4|5|7|8)\d{9}$/.test(phone))){ 
        alert("手机号码有误，请重填");  
        return false; 
} 

  if(myform.book_add.value.length<1){
  alert("请输入城市!"); //Please fill out the form!
  return false;
  }
  else if(myform.book_add.value=="城市"){
  alert("请输入城市!");
  myform.book_add.value="";
  myform.book_add.focus();
  return false;
}	
  
//E-MAIL邮件地址检测
if (myform.book_mail){
	if (myform.book_mail.value == ""){
		alert("请输入E-MAIL地址！"); //E-mail address cannot be blank!
		myform.book_mail.focus();
		return (false);
	}
	var re = new RegExp("^([A-Za-z0-9_|-]+[.]*[A-Za-z0-9_|-]+)+@[A-Za-z0-9|-]+([.][A-Za-z0-9|-]+)*[.][A-Za-z0-9]+$","ig");
	{if (!re.test(myform.book_mail.value))
		{alert("您的E-MAIL格式不正确，请正确输入！"); //The e-mail format is incorrect!
		myform.book_mail.focus();
		return false;
		}
	}
}
//E-MAIL end
}


//清除gbook文本
function OnEnter( field ) { if( field.value == field.defaultValue ) { field.value = ""; } }
function OnExit( field ) { if( field.value == "" ) { field.value = field.defaultValue; } }

//js容错
window.onerror=function(){return true;} 


//gbook form post 
window.onload=function (){
  var form = document.getElementById("myform");
  form.action  =  "js/gbook_do.php?do=book_add";
}