vf_commandlink

<!-- Page: -->
<apex:page standardController="Account" showHeader="false" sidebar="false" id="pg">
    <apex:form id="frm">
            <apex:pageBlock title="My Content" mode="edit" >
                <apex:commandLink action="{!save}" value="Save" id="theCommandLink" style="margin:auto; text-align:center; display:block;"/>
                <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>