I need to link paypal and forms

What I want is two forms,

When you select the first, the data in the 2nd form is linked from the first selected, example;


Form 1 - Select Course
Form 2 - Available Course Dates (linked to the selected course)
Price: - Course Price (linked to the selected course)

Paypal Button - Pay Now

So Course 1 could have an April and May
Course 2 = September and January
and so on.

So when they pay with paypal, the data from the two forms and price are in paypal also, I think I could setup the paypal button to have the price anyway, but its linking the two forms togethe that I am having issues with,

Where do I start?

Do I need php and mysql?
or could it be done through html?

 

You could try passing the first form through a php form processer, and then create the applicable pay now link through the following Pay Now code:

    <form target="paypal" action="https://www.paypal.com/cgi-bin/webscr" method="post">
      <input name="cmd" type="hidden" id="cmd" value="_cart">
      <input name="business" type="hidden" id="business" value="BUSINESS EMAIL">
      <font face="Arial" color="#000000"><small> </small> <small> </small> </font><font size="2" face="Arial"> 
      </font><font color="#000000" face="Arial"><small> </small> <small> </small> 
      <small> </small> <small> </small> <small> </small> <small> </small></font><font color="#000000"><small> 
      </small></font><font color="#000000" face="Arial"><small> </small> <small>
      <input type="hidden" name="item_name" value="ITEM NAME">
      </small> <small> </small></font><font color="#000000"><small> </small></font><font color="#000000" face="Arial"><small> 
      </small> <small> </small> <small> </small> <small> </small> <small> </small> 
      <small> </small></font><font size="2" face="Arial"> </font><font face="Arial" color="#000000"> 
      <small> </small> <small> </small></font> 
      <input name="amount" type="hidden" id="amount" value="COST">
      <input name="return" type="hidden" id="return" value="RETURN URL">
      <input name="currency_code" type="hidden" id="currency_code" value="USD">
      <input name="lc" type="hidden" id="lc" value="US">
      <input name="submit" type="image" id="submit" src="http://www.paypal.com/en_US/i/btn/sc-but-03.gif" alt="Make payments with PayPal - it's fast, free and secure!" border="0">
      <input name="add" type="hidden" id="add" value="1">
      <strong><font color="#0000FF" face="Verdana"><br>
      <br>
      Only: COST</font></strong> 
    </form>

HTML:

.

That should work nicely.