var rand_n=Math.ceil(Math.random()*20);
var rand=""
var output="";
for(var i=0;i<5;i++) {
	rand_n+=i;
	if(rand_n>20) rand_n-=20;
	rand=rand_n;
	if(rand<10) rand="0"+rand;
	if(rand<100) rand="0"+rand;
	output+='<a href="http://www.moldincalifornia.com/img/gallery/'+rand+'.jpg"><img src="http://www.moldincalifornia.com/img/gallery/tn/'+rand+'.jpg" class="tn"></a><br />';
}
document.write(output);