Help with downloading JSTL library

Hi everyone,
I've just started doing my second year degree in Multimedia Computing and am doing a year long module in JSP. I've installed Tomcat and everything at home but I'm having trouble getting my code to work which I've copied out of my book to see how it works. This is what I have written in JPadPro...
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<c:set value="Tiddles" var="myCat" />
<c:set var="myDbId" scope="application">jdbc:mysql://localhost/eg02dsdb</c:set>
<html>
<head>
<title> Question 1 </title>
</head>
<body>
<p>
myCat is
<c:out value="${pageScope.myCat}" default="No myCat object on this page"/>
myDbId is
<c:out value="${applicationScope.myDbId}" default="No myDbId object in this application"/>
</p>
</body>
</html>
When I come to open the JSP file in http://localhost:8080 a message appears stating....
The server encountered an internal error () that prevented it from fulfilling this request.
org.apache.jasper.JasperException: File "/WEB-INF/tld/c.tld" not found
After doing some research on the Internet I figured that I might need to download the JSTL core library off Apache's website. However when I get to the download page I don't have a clue which link to click on and what to do fromt there. There's loads of links saying things like BCSL, Cactus etc and they all have a link beside them that says KEYS and two files under each, one a .zip and the other a tar.gz but I don't have a clue which links I have to click on or anything. I have seen a few Tomcat links but don't know whether I should click on them. I just don't want to download the wrong stuff and mess up and files that are already in place in my j3t folder. If anyone could help me I'd really appreciate it! Thank you so much.
Joe P

I don't know how to award the duke points but i'll do that in a sec for you. I do have mySQL on the machine but I don't have it running. That may be why, as for the classes and that, I haven't created any. I simply copied the code out of this workbook my lecture created as an example. That may be the reason the code doesn't work, its probably because I don't have the classes he created on machine. I did just try doing a simple mathematical equation in the JSP file though and that produced the following results...
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:set value="Tiddles" var="myCat" />
<c:set var="myDbId" scope="application">jdbc:mysql://localhost/eg02dsdb</c:set>
<html>
<head>
<title> Question 1 </title>
</head>
<body>
<p>
myCat is
<c:out value="${pageScope.myCat}" default="No myCat object on this page"/>
myDbId is
<c:out value="${applicationScope.myDbId}" default="No myDbId object in this application"/>
3+4+*5=
<c:out value="${3+4*5}"/>
</p>
</body>
</html>
myCat is ${pageScope.myCat}
myDbId is ${applicationScope.myDbId}
3+4+*5= ${3+4*5}
I'll award you these duke points now, thank you for trying to help me, sorry I'm a bit slow with understanding all this, I did a lot of quite simple java last year but it wasn't one of my favourite subject areas.

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