function rand(min, max) {
	// http://kevin.vanzonneveld.net
	// +   original by: Leslie Hoare
	// +   bugfixed by: Onno Marsman
	// *     example 1: rand(1, 1);
	// *     returns 1: 1
	var argc = arguments.length;
	if (argc == 0) {
		min = 0;
		max = 2147483647;
	} else if (argc == 1) {
		throw new Error('Warning: rand() expects exactly 2 parameters, 1 given');
	}
	return Math.floor(Math.random() * (max - min + 1)) + min;
}

var pstring = "0123456789";
var plength = pstring.length;
var a = '';
for (i = 1; i <= 14; i++) {
	var start = rand(0,plength);
	a = a + pstring.substr(start, 1);
}

var el = $('nutrition-guide');
new Element('img', {
	'src': 'http://ad.doubleclick.net/activity;src=1467297;type=tacob888;cat=nutri724;ord=1;num=' + a + '?',
	'alt': '',
	'width': '1',
	'height': '1'
}).inject(el);