[Squirrel-sql-users] Connecting to mySQL Database

Hi,
I am now trying to use Squirrel to connect to a mySql database and 
get the following error :

Java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver
        at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
        at java.security.AccessController.doPrivileged(Native 
Method)
        at 
java.net.URLClassLoader.findClass(URLClassLoader.java:187)
        at 
net.sourceforge.squirrel_sql.fw.util.MyURLClassLoader.findClass(MyURLClassLoader.java:113)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
        at 
net.sourceforge.squirrel_sql.fw.sql.SQLDriverManager.getConnection(SQLDriverManager.java:96)
        at 
net.sourceforge.squirrel_sql.client.mainframe.action.OpenConnectionCommand.execute(OpenConnectionCommand.java:112)
        at 
net.sourceforge.squirrel_sql.client.mainframe.action.ConnectToAliasCommand$SheetHandler.run(ConnectToAliasCommand.java:345)
        at 
net.sourceforge.squirrel_sql.fw.util.TaskExecuter.run(TaskExecuter.java:65)
        at java.lang.Thread.run(Thread.java:534)

Any idea what this means please?

As an ordinary user I can connect form the command line so I 
assume it is not permissions or password problems.

tia,
Norm