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The Math Object
Random Changes

To keep people coming back it is sometimes nice to have your index page different each time.
For instance :
On my personal pages Geoff's World I play a different midi randomly chosen each time the page is reloaded.

To do this it is a simple matter of using JavaScript 'random' to choose a number and then accessing an array with that number.

There are a couple of things that we must understand first.

JavaScript random will give you a number between 0 and 1

Not much good to us like that but if we multiply it by the number of choices we need it begins to make sense
choice=Math.random()* 4;
Last thing is to make the number an integer getting rid of all that superfluous stuff after the decimal point
For this we use 'Math.round'
choice=Math.round(Math.random()* 4);

What we have done is combine three steps in one statement which makes sense.
It could have been written
choice = Math.random;
choice = choice * 4;
choice = Math.round (choice );
We now have a number between 0 and 4 ( Remember this is a computer language so you have 5 choices )
We can access an array with the answer to alter the experience on each reload.
Recapping : Here is the script
<Script Language="JavaScript">
choice = Math.round(Math.random() * 4 );
message = new Array ( 'Hello' , 'Hi' , 'Aloha' , 'Bon Jour' , 'Ciao');

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