Adding paypal to a site already upgraded

Question

hi
the site ceramicplanet.co.uk is about to open an ebay shop so we openned a paypal account and thought we'd add it to the site as an extra payment option for customers but I and paypal uk are having trouble.
we went live just taking card payments so I removed the payment method.
Now I want to add paypal ive added the original radio buttons with the options
   <div class="item">
    <label>Payment Method <span class="req">*</span></label><br />
    <input checked="checked" type="radio" name="PaymentMethodType" id="PaymentMethodType_1" value="1" />Credit Card<br />
    <input id="PaymentMethodType" type="radio" name="PaymentMethodType" value="8" />Direct Debit<br />
    <input type="radio" name="PaymentMethodType" id="PaymentMethodType_5" value="5" />PayPal<br />
    </div>
and I follwed the instructions on implementing paypal http://kb.worldsecuresystems.com/kb/set-paypal-standard.html
however Its still not obvious to me how the customer is meant to use the paypal option on the checkout pay?
Im under the impression they are taken to a paypal site to complete the order and then back to the site but how?
do they select the radio button and press the submit button because all that happens is the page states the credit card details havent been filled in and that they are required.
Am i meant to add a paypal button to the page? I havent see anything on business catalyst saying i have to but when settting up the paypal account they seem to have a lot of button options to add to your site?
Is it something to do with my order form? Ive changed it over time to suite our look but cant see why that would have anything to do with paypal not working.
Also I work in the UK. whenever i talk to people/services like paypal uk about business catalyst most dont know alot about the system. Im assuming its more an american and australian thing but im asking there isnt anything special I have to do to make paypal work do I? the service advisor has asked me to keep him updated on this intergration as he says they have had problems the last few months trying to implement paypal on catalyst sites, Im guessing this is them not being use to your systems but thought id put it out there that paypal dont seem up to date with catalyst. 
any help appreciated
Dave
ps just read this on http://www.siroccowebdesign.com.au/business-catalyst-tutorials/tag/Payment_Gateways/
Please note that non-seamless payment gateways such as PayPal can only be used within the online shop and the checkout process. This type of payment gateway by its nature, cannot be used in conjunction with the web forms functionality to process credit card payments.
So now im abit lost on how to implement paypal?

Answer 1

just to let you guys know I was missing parts of java from my page. This is what was originally at the bottom of the reg-buy template.
  <script type="text/javascript" src="/CatalystScripts/ValidationFunctions.js"></script>
    <script language="javascript" type="text/javascript">
                              //<![CDATA[
                              var submitcount42059 = 0;function checkWholeForm42059(theForm){var why = "";if (theForm.FirstName) why += isEmpty(theForm.FirstName.value, "First Name");if (theForm.LastName) why += isEmpty(theForm.LastName.value, "Last Name"); if (theForm.EmailAddress) why += checkEmail(theForm.EmailAddress.value); if (!theForm.PaymentMethodType || getRadioSelected(theForm.PaymentMethodType) == 1) { if (theForm.CardName) why += isEmpty(theForm.CardName.value, "Name on Card"); if (theForm.CardNumber) why += isNumeric(theForm.CardNumber.value, "Card Number"); if (theForm.Amount) why += isCurrency(theForm.Amount.value, "Amount"); } if (theForm.PaymentMethodType) why += checkSelected(theForm.PaymentMethodType, "Payment Method");if(why != ""){alert(why);return false;}if(submitcount42059 == 0){submitcount42059++;theForm.submit();return false;}else{alert("Form submission is in progress.");return false;}}
                              // Credit Card info is not required if paying by PayPal, Hosted Credit Card, COD etc
                              function ShowCCFields(val) {
                                        if (!document.getElementById('paymentdiv'))
                                                  return;  
                                        if (val != 1)
                                                  document.getElementById('paymentdiv').style.display = 'none';
                                        else
                                                  document.getElementById('paymentdiv').style.display = 'inline';
                              //]]>
                    </script>
now my only problem is that being a UK site we have debit card sales and of course this need the card details box open when the radio button is picked so i added this line to the java
  if (val != 1)
        if (val != 8)
  document.getElementById('paymentdiv').style.display = 'none';
  else
  document.getElementById('paymentdiv').style.display = 'inline';
  //]]>
  </script>
however I dont think ive added the line correctly because when testing the site if I pick paypal the card details collapes. If i then select credit card the card details box does not expand, but it does expand for the direct debit if selected. How should I add the (val !=8) so that the credit card val != 1 still works.
dave