if ((Modal.confirm && Modal.confirm('Once you submit this record for approval, you might not be able to edit it or recall it from the approval process depending on your settings. Continue?'))
|| (!Modal.confirm && window.confirm('Once you submit this record for approval, you might not be able to edit it or recall it from the approval process depending on your settings. Continue?')))

navigateToUrl('/p/process/Submit?retURL=%2F{!Account.Id}&_CONFIRMATIONTOKEN=VmpFPSxNakF4Tnkwd09TMHlORlF3TXpveU9Ub3hNQzR4TVROYSwtTFBMbnZnd1VrNVZFMlV6YzFoTHpHLE5qazROV1pt&id={!Account.Id}','DETAIL','submit');
{!URLFOR(target, id, [inputs], [no override])}

public AccountExtensionController(ApexPages.StandardController standardController)
{
    this.standardController = standardController;
    showHideButton();
    system.debug('Check1');
}
public Boolean showHideButton()
{
    accountId= ApexPages.currentPage().getParameters().get('id');
    hideSubmitForApprovalButton =false;
    system.debug('Check2'+hideSubmitForApprovalButton );
    accountList =[select id, Ownership from account where id =: accountId];
    if(accountList.size()>0)
        {
            if(accountList[0].Ownership == 'Private' || accountList[0].Ownership  == 'Subsidiary')
            {
                hideSubmitForApprovalButton=true;
                system.debug('Check3'+hideSubmitForApprovalButton );
            }
        }
         system.debug('Check4'+hideSubmitForApprovalButton );
        return hideSubmitForApprovalButton;
}