change name of xml tags with xslt if there other tag present.

Hi i Have the following xml, just have to change the the tag name based on the existence of another tag, could anyone please direct me how to do this in xslt.

current xml:

<Details>
                        <Cash>
                                    <TitleLogo> cash.gif</TitleLogo>
                                    <Title> Benefits</Title>
                                    <Approval>
                                                <Title>Who qualifies?</Title>
                                                <TitleLogo> eligible.gif</TitleLogo>
                                                <Header1>Who qualifies?</Header1>
                                                <Header2>When?</Header2>
                                                <Header3>How Much?</Header3>
                                                <Qualified>
                                                            <Person>
                                                                        <Names>\b.PAT, PEN, TAM, TON\b0.\n\n\n\n\n.</Names>
                                                                        <When>Dec 26, 2014</When>
                                                                        <HowMuch>$158.00 twice per month</HowMuch>
                                                            </Person>
                                                </Qualified>
                                                <Footer>\b.PAT, PEN, TAM, TON\b0.: To get this benefit, you and all members of your amily must be working and have earned income that we use to determine your monthly benefit.\n\n.</Footer>
                                    </Approval>
                        </Cash>
                        <Cash>
                                    <TitleLogo> cash.gif</TitleLogo>
                                    <Title> Benefits</Title>
                                    <Rejection>
                                                <Title>Who does not qualify?</Title>
                                                <TitleLogo>d:\Apps\MCI\SAT\Adobe\Corr\Logo\icon_elig_ineligible.gif</TitleLogo>
                                                <Header1>Who?</Header1>
                                                <Header2>Date of our decision?</Header2>
                                                <Description>
                                                            <Reason>
                                                                        <Value1>\b.TAM, TON\b0.</Value1>
                                                                        <Value2>December 16, 2014\n\n.</Value2>
                                                            </Reason>
                                                </Description>
                                                <Footer>\b.TAM, TON\b0.: Inside this letter you can learn more about the income and deductions we used to decide if you qualify</Footer>
                                    </Rejection>
                        </Cash>
<Details>

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need to change to below xml using xslt. the 2nd <cash> tag should be changed to <cashR> if there is a <Rejection> tag exists.

<Details>
                        <Cash>
                                    <TitleLogo> cash.gif</TitleLogo>
                                    <Title> Benefits</Title>
                                    <Approval>
                                                <Title>Who qualifies?</Title>
                                                <TitleLogo> eligible.gif</TitleLogo>
                                                <Header1>Who qualifies?</Header1>
                                                <Header2>When?</Header2>
                                                <Header3>How Much?</Header3>
                                                <Qualified>
                                                            <Person>
                                                                        <Names>\b.PAT, PEN, TAM, TON\b0.\n\n\n\n\n.</Names>
                                                                        <When>Dec 26, 2014</When>
                                                                        <HowMuch>$158.00 twice per month</HowMuch>
                                                            </Person>
                                                </Qualified>
                                                <Footer>\b.PAT, PEN, TAM, TON\b0.: To get this benefit, you and all members of your amily must be working and have earned income that we use to determine your monthly benefit.\n\n.</Footer>
                                    </Approval>
                        </Cash>
                       [b] <CashR>[/b]
                                    <TitleLogo> cash.gif</TitleLogo>
                                    <Title> Benefits</Title>
                                    <Rejection>
                                                <Title>Who does not qualify?</Title>
                                                <TitleLogo>d:\Apps\MCI\SAT\Adobe\Corr\Logo\icon_elig_ineligible.gif</TitleLogo>
                                                <Header1>Who?</Header1>
                                                <Header2>Date of our decision?</Header2>
                                                <Description>
                                                            <Reason>
                                                                        <Value1>\b.TAM, TON\b0.</Value1>
                                                                        <Value2>December 16, 2014\n\n.</Value2>
                                                            </Reason>
                                                </Description>
                                                <Footer>\b.TAM, TON\b0.: Inside this letter you can learn more about the income and deductions we used to decide if you qualify</Footer>
                                    </Rejection>
                        [b]</CashR>[/b]
<Details>

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