var path_to_thumbc='3/'; 
var num_of_thumbc=7;
var code_numc=num_of_thumbc-1;
thumbsc = new Array(code_numc);
<!-- Script writed by Doctor, 2003, for questions knock ICQ 171114296 :o)) -->
function genc(n){return (Math.round(Math.random()*n)+1);}
function check_numc(num){
for (j=0;j<=code_numc;j++){if (thumbsc[j]==num) return false};
return true;}

ex=genc(code_numc);
for (k=0;k<=code_numc;k++){
if (check_numc(ex)) {thumbsc[k]=ex;}
	else {
		while (check_numc(ex)==false) {ex=genc(num_of_thumbc-1)};
		thumbsc[k]=ex;
		}
}
var tc=0;
function thumb_viewc(){
document.writeln('<IMG SRC="'+path_to_thumbc+thumbsc[tc]+'.jpg">');
t++;
}