function randomizeBg(min, max) {
	if (!min)
		min = 0;
	if (!max)
		max = 1;
	return Math.floor(Math.random()*(max+1)+min);
}
function randomBg() {
	var bgs = new Array(); 	
		bgs.push("/css/lusvanlinne/backgrounds/bg_01.jpg");
		bgs.push("/css/lusvanlinne/backgrounds/bg_02.jpg");
		bgs.push("/css/lusvanlinne/backgrounds/bg_03.jpg");
		bgs.push("/css/lusvanlinne/backgrounds/bg_04.jpg");
		bgs.push("/css/lusvanlinne/backgrounds/bg_05.jpg");
		bgs.push("/css/lusvanlinne/backgrounds/bg_06.jpg");
		bgs.push("/css/lusvanlinne/backgrounds/bg_07.jpg");
		bgs.push("/css/lusvanlinne/backgrounds/bg_08.jpg");
		bgs.push("/css/lusvanlinne/backgrounds/bg_09.jpg");
		bgs.push("/css/lusvanlinne/backgrounds/bg_10.jpg");
		bgs.push("/css/lusvanlinne/backgrounds/bg_11.jpg");
		document.getElementById('mainholder').style.background = "url(" + bgs[randomizeBg(0, bgs.length-1)] + ")";
		
}