Dynamically arrange some elements around a circle

Here's some code that should help you:

var numElements = 4,
    angle = 0
    step = (2*Math.PI) / numElements;
for(var i = 0; i < numElements.length; i++) {
    var x = container_width/2 + radius * Math.cos(angle);
    var y = container_height/2 + radius * Math.sin(angle);
    angle += step;
}

It is not complete but should give you a good start.

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Update: Here's something that actually works:

var radius = 200; // radius of the circle
var fields = $('.field'),
    container = $('#container'),
    width = container.width(),
    height = container.height(),
    angle = 0,
    step = (2*Math.PI) / fields.length;
fields.each(function() {
    var x = Math.round(width/2 + radius * Math.cos(angle) - $(this).width()/2),
        y = Math.round(height/2 + radius * Math.sin(angle) - $(this).height()/2);
    $(this).css({
        left: x + 'px',
        top: y + 'px'
    });
    angle += step;
});

Demo: http://jsfiddle.net/ThiefMaster/LPh33/
Here's an improved version where you can change the element count.

I've combined ThiefMaster's fiddle with the jQuery pointAt plugin:

Demo: http://jsfiddle.net/BananaAcid/nytN6/

the code is somewhat like above.
might be interesting to some of you.

For an element around a centre at (x, y), distance r, the element's centre should be positioned at:

(x + r cos(2kπ/n), y + r sin(2kπ/n))

where n is the number of elements, and k is the "number" of the element you're currently positioning (between 1 and n inclusive).