Add A Button To Launch Script?

I put together a little script to calculate and list a Fibonacci sequence (with javascript: The Definitive Guide 5th edition). It works fine when left as a plain script to run when the page loads, but if I try to turn it into a function to execute on the push of a button the script appears to do nothing.Here is the plain Fibonacci code:

Code:

document.write("<h2>Table of Fibonacci Numbers</h2>");
for (i=0, j=1, k=0, fib =0; i<50; i++, fib=j+k, j=k, k=fib){
document.write("Fibonacci (" + i + ") = " + fib);
document.write("<br />");
}

I then turned it into a function so that it would not run until I clicked an HTML form button. I tried two different methods, one with function containing only the code above and the other as follows:

Code:

<form>
<input type="button" value="Fibonacci" onlcick="javascript: Fib();" />
</form>
<script>

[code]....