probably easy, but how to divide skeleton boilerplate into 5 pieces?
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It has been a while since I last posted here, but the school vacations just started, so thats why I'm here with a few questions :)

I would like to start with the following boilerplate, http://getskeleton.com/ 
It's the first time I design and script with a 960gs template, and I totally don't get it.

According to a few tutorials, I understood that width of the page counts 16 columns. For example, you can divide your page into ten column and a six column:

-Took the following code straight away from the skeleton layout.css-

     /* Base Grid */
    .container .one.column,
    .container .one.columns                     { width: 40px;  }
    .container .two.columns                     { width: 100px; }
    .container .three.columns                   { width: 160px; }
    .container .four.columns                    { width: 220px; }
    .container .five.columns                    { width: 280px; }
    .container .six.columns                     { width: 340px; }
    .container .seven.columns                   { width: 400px; }
    .container .eight.columns                   { width: 460px; }
    .container .nine.columns                    { width: 520px; }
    .container .ten.columns                     { width: 580px; }
    .container .eleven.columns                  { width: 640px; }
    .container .twelve.columns                  { width: 700px; }
    .container .thirteen.columns                { width: 760px; }
    .container .fourteen.columns                { width: 820px; }
    .container .fifteen.columns                 { width: 880px; }
    .container .sixteen.columns                 { width: 940px; }

    .container .one-third.column                { width: 300px; }
    .container .two-thirds.column               { width: 620px; }

The problem is, I would like to divide my page into 5 parts (with margin ofc)... 
But how? I could use three columns 5 times, but that would count up to a total of 15 columns. Is there any way to do this? I'm probably too n00b to think of the probably easy answer.


-Sorry for the worst English, I just go back to school asap-