function setpag(a){

net=(!document.all && document.getElementById)? 2:0;
bro=(document.all)? 1:net;

if(bro=="1"){stile=document.styleSheets[0].rules;}
else{stile=document.styleSheets[0].cssRules;}

stile[0].style.display= "none";
stile[1].style.display= "none";
stile[2].style.display= "none";
stile[3].style.display= "none";
stile[4].style.display= "none";
stile[5].style.display= "none";
stile[a-1].style.display= "inline";

}