Disable multiple input field

I want to disable multiple apex:inputText.
1.Click the checkbox.
2.I want to Disable inputText.

I can disable single inputText.
But, I can't assigne the same id to other apex:inputText.
What should I do?

<apex:page controller="EntryController" showHeader="true" sidebar="false" title="サンプル" docType="html-5.0" id="page" tabStyle="Account"  >

<apex:sectionHeader id="header" title="サンプル"/>
<apex:form >
    <div id="all">
        <div id="form">
            <apex:outputPanel >
                <apex:pageBlock title="配送先">
                    <apex:pageBlockSection >
                        <apex:inputField value="{!newContract.isShippingSame__c}">
                            <apex:actionSupport reRender="isSame" event="onchange" />
                        </apex:inputField><div/>
                        <apex:inputText value="{!newContract.ShippingAddressee__c}" label="発送先名" id="isSame" disabled="{!newContract.isShippingSame__c}" /><br/>
                        <apex:inputText value="{!shippingPostalcode}" label="郵便番号" />
                        <apex:inputText value="{!shippingState}" label="住所にする"/>
                        <apex:inputText value="{!newContract.RecieverName__c}" label="受取者名" />
                        <apex:inputText value="{!newContract.RecieverPhone__c}" label="受取者TEL" />                        
                    </apex:pageBlockSection>
                </apex:pageBlock>
            </apex:outputPanel>
        </div>
    </div>

</apex:form>

EntryController.apxc

    public class EntryController {

        public Contract__c newContract{get; set;}
        public String shippingPostalcode{get; set;}
　　　　public String shippingState{get; set;}

        // コンストラクタ
        public EntryController(){
            this.newContract=new Contract__c();
            this.newContract.isShippingSame__c=false;
　　　　　　 this.shippingPostalcode='';
       　　 this.shippingState='';
        }
    }