function randomize(min, max) {
	if (!min)
		min = 0;
	if (!max)
		max = 1;
	return Math.floor(Math.random()*(max+1)+min);
}
function randomBg() {
	var bgs = new Array();

	// I took these images from a site with a similar script already only to get example images
	// I wrote this script myself
	bgs.push("img/bg/bg_01.jpg");
	bgs.push("img/bg/bg_02.jpg");

	document.body.style.backgroundImage = "url(" + bgs[randomize(0, bgs.length-1)] + ")";
}