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.

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.

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).

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.

Arrange Elements In Circle (Javascript)

function arrangeElementsInCircle (elements, x, y, r) {
    for (var i = 0; i < elements.length; i++) {
        elements[i].scaleX = 1 / elements.length
        elements[i].scaleY = 1 / elements.length
        elements[i].x = (x + r * Math.cos((2 * Math.PI) * i/elements.length))
        elements[i].y = (y + r * Math.sin((2 * Math.PI) * i/store.length))
    }
}

Where x,y is point co-ordinates and elements is array of elements to be placed and r is radius.