Hi all 

I want to Edit the Account by using the Check Box .

here is my visual force page 

<apex:page controller="CustomAccountLookupController2"
title="Search"
showHeader="false"
sideBar="false"
tabStyle="Account"
id="pg">

<script>
function validateandclose(name,RecId){

if(document.getElementById("RecordContent")){
var errorString = document.getElementById("RecordContent").innerHTML;
if(errorString.indexOf('Error:')==-1){//alert("in Validate");
fillIn(name,RecId);
}
}

}
function fillIn(name,id)
{
var winMain=window.opener;
if (null==winMain)
{
winMain=window.parent.opener;
}

var ele=winMain.document.getElementById('{!$CurrentPage.parameters.txt}');
//alert(id + '####' + ele);
ele.value=name;
var idval = '{!$CurrentPage.parameters.txt}' + '_lkid';

ele=winMain.document.getElementById(idval);
//alert(ele)
ele.value=id;

CloseWindow();
}
function CloseWindow()
{
var winMain=window.opener;
if (winMain != null) {
window.close();
if (null==winMain)
{
winMain=window.parent.opener;
}
//winMain.closeLookupPopup();
}

}
</script>

<apex:form id="f">
<apex:outputPanel id="page" layout="block" style="margin:5px;padding:10px;padding-top:2px;">
<apex:tabPanel switchType="client" selectedTab="name1" id="tabbedPanel">

<!-- SEARCH TAB -->
<apex:tab label="Search" name="tab1" id="tabOne">

<apex:actionRegion >
<apex:outputPanel id="top" layout="block" style="margin:5px;padding:10px;padding-top:2px;">
<apex:outputLabel value="Search" style="font-weight:Bold;padding-right:10px;" for="txtSearch"/>
<apex:inputText id="txtSearch" value="{!searchString}" />
<span style="padding-left:5px"><apex:commandButton id="btnGo" value="Go" action="{!Search}" rerender="searchResults"></apex:commandButton></span>
</apex:outputPanel>

<apex:outputPanel id="pnlSearchResults" style="margin:10px;height:350px;overflow-Y:auto;" layout="block">
<apex:pageBlock id="searchResults">
<apex:pageBlockButtons>
<apex:commandButton value="Edit"/>
<apex:commandButton value="Save"/>
</apex:pageBlockButtons>
<apex:pageBlockTable value="{!results}" var="a" id="tblResults">
<apex:column >

<apex:inputCheckbox/>


</apex:column>
<apex:column >
<apex:facet name="header">
<apex:outputPanel >Name</apex:outputPanel>
</apex:facet>
<apex:outputLink value="javascript&colon;top.window.opener.lookupPick2('{!FormTag}','{!TextBox}_lkid','{!TextBox}','{!a.Id}','{!a.Name}', false)" rendered="{!NOT(ISNULL(a.Id))}">{!a.Name}</apex:outputLink>
</apex:column>
<apex:column >
<apex:facet name="header">
<apex:outputPanel >Business AddressLine1</apex:outputPanel>
</apex:facet> {!a.Main_Address_Line1__c}
</apex:column>
<apex:column>
<apex:facet name="header">
<apex:outputPanel>Business AddressLine2</apex:outputPanel>
</apex:facet>{!a.Main_Address_Line2__c}
</apex:column>
<apex:column>
<apex:facet name="header">
<apex:outputPanel>Business AddressLine3</apex:outputPanel>
</apex:facet> {!a.Main_Address_Line3__c}
</apex:column>
<apex:column>
<apex:facet name="header">
<apex:outputPanel>City</apex:outputPanel>
</apex:facet> {!a.Main_City__c}
</apex:column>
<apex:column>
<apex:facet name="header">
<apex:outputPanel>State</apex:outputPanel>
</apex:facet>{!a.Main_State__c}
</apex:column>
<apex:column>
<apex:facet name="header">
<apex:outputPanel>Country</apex:outputPanel>
</apex:facet>{!a.Main_Country__c}
</apex:column>
</apex:pageBlockTable>
</apex:pageBlock>
</apex:outputPanel>
</apex:actionRegion>

</apex:tab>

<!-- NEW ACCOUNT TAB -->
<apex:tab label="New Account" name="tab2" id="tabTwo">

<apex:pageBlock id="newAccount" title="New Account" >
<div id="RecordContent">
<apex:pageBlockButtons >
<!--<apex:commandButton action="{!saveAccount}" value="Save" />-->
<apex:commandButton action="{!saveAccount}" value="Save" oncomplete="validateandclose('{!insertedRecName}','{!insertedRecId}')" reRender="newAccount"/>

</apex:pageBlockButtons>
<apex:pageMessages />

<apex:pageBlockSection columns="2" id="pbs">
<apex:inputField value="{!Account.Name}" required="true" id="aname" taborderhint="1"/>
<apex:inputField value="{!Account.Type}" id="type" taborderhint="6"/>
<apex:inputField value="{!Account.Main_Address_Line1__c}" id="line1" taborderhint="2"/>
<apex:inputField value="{!Account.Main_City__c}" id="city" taborderhint="7"/>
<apex:inputField value="{!Account.Main_Address_Line2__c}" id="line2" taborderhint="3"/>
<apex:inputField value="{!Account.Main_State__c}" id="state" taborderhint="8"/>

<apex:inputField value="{!Account.Main_Address_Line3__c}" id="line3" taborderhint="4"/>
<apex:inputField value="{!Account.Main_Country__c}" id="cntry" taborderhint="9"/>
<apex:inputField value="{!Account.Business_Zip_Code__c}" id="code" taborderhint="5"/>
<apex:inputField value="{!Account.Region__c}" id="reg" taborderhint="10"/>


<!-- <apex:repeat value="{!$ObjectType.Account.FieldSets.CustomAccountLookup}" var="f">

<apex:inputField value="{!Account[f]}"/>
</apex:repeat>-->
</apex:pageBlockSection>
</div>
</apex:pageBlock>

</apex:tab>
</apex:tabPanel>
</apex:outputPanel>
</apex:form>
</apex:page>

Controller 

public with sharing class CustomAccountLookupController2 {

public Account account {get;set;} // new account to create
public List<Account> results{get;set;} // search results
public string searchString{get;set;} // search keyword
public String insertedRecId{get;set;}//inserted Record Id
public String insertedRecName{get;set;}//inserted Record Name

public CustomAccountLookupController2() {
account = new Account();
// get the current search string
searchString = System.currentPageReference().getParameters().get('lksrch');
runSearch();
}

// performs the keyword search
public PageReference search() {
runSearch();
return null;
}

// prepare the query and issue the search command
private void runSearch() {
// TODO prepare query string for complex serarches & prevent injections
results = performSearch(searchString);
}

// run the search and return the records found.
private List<Account> performSearch(string searchString) {

String soql = 'select id, name , type ,Main_Address_Line1__c,Main_Address_Line2__c,Main_Address_Line3__c,Main_City__c,Main_Country__c,Main_State__c,Business_Zip_Code__c from account';
if(searchString != '' && searchString != null)
soql = soql + ' where name LIKE \'%' + searchString +'%\'' ;
soql = soql + ' limit 25';
System.debug(soql);
return database.query(soql);

}

// save the new account record
public PageReference saveAccount() {

// save the new contactrecord
if(account.name<>''){
insert account;
List<sObject> Resultlist = new List<sObject>();
if(account.Id!=null){
string soql = 'select Name from Account where Id = \'' + account.Id + '\'';
Resultlist = database.query(soql); // Required ResultList.
for(sObject sObj : Resultlist){
insertedRecName= (String) sObj.get('name');
insertedRecId = (String) sObj.get('id');

}
}
// reset the contact
account= new Account ();
return null;} else{return null;}
}


// used by the visualforce page to send the link to the right dom element
public string getFormTag() {
return System.currentPageReference().getParameters().get('frm');
}

// used by the visualforce page to send the link to the right dom element for the text box
public string getTextBox() {
return System.currentPageReference().getParameters().get('txt');
}

}my require ment is when i click on the check box and click on the Edit Button i has to check how many Conatct are there under this Account if Contacts are more than one i has to thrown Error like 'Do not edit this Account'. if it is having only one Accoutn then user can Edit the Account.