Select random radio buttons

radio-random-select.js

var groups = {};
$('input:radio').each(function() {
	groups[this.name] = true;
});
$.each(groups, function(name, bool) {
	var radios = $('input:radio[name=' + name + ']');
	if(radios.length > 0) {
		var rd = Math.floor(Math.random() * radios.length);
		// Remove first and 2nd option
		rd = ((rd + 2) < radios.length) ? rd + 2 : rd;
    		radios[rd].checked = true;
	}
});