function get_random(min, max)
{
	return Math.round(Math.random()*(max-min)) + min
}

function random_images()
{
	var num;
	var nums = Array();
	var cnt = 0;
	var i, j;
	var dbl;
	
	while (cnt < 4) {
		num = get_random(1, 21);
		if (cnt == 0) { 
			cnt++;
			nums[cnt] = num;
		}
		else {
			dbl = false;
			cnt++;
			for (j = 1; j < cnt; j++) {
				if (num == nums[j]) {
					cnt--;
					dbl = true;
				}
			}
			if (dbl == false) {
				nums[cnt] = num;
			}
		}
	}

	for (i = 1; i <= 4; i++) {
		document.write('<img src="/images/klanten/img_' + nums[i] + '.jpg" alt="" /><br/>');
	}


}