vf_commandbutton

<!-- Page: -->
<apex:page standardController="Account" id="pg">
    <apex:form id="frm">
            <apex:pageBlock title="My Content" mode="edit" >
                <apex:pageBlockButtons >
                    <apex:commandButton value="Save" />
                </apex:pageBlockButtons>
                <apex:pageBlockSection title="My Content Section" columns="2">
                    <apex:inputField value="{!account.name}"/>
                    <apex:inputField value="{!account.site}"/>
                    <apex:inputField value="{!account.type}"/>
                    <apex:inputField value="{!account.accountNumber}"/>
                </apex:pageBlockSection>
            </apex:pageBlock>
    </apex:form>
</apex:page>