var a=[1,2,3,4,5,6,7,8,9,10];

Array.prototype.next=function(){
if (this.index==null||this.index==(this.length-1))
{
this.index=-1;
}
this.index++;
return this[this.index];
}

var b =3;
a.index=b-1;
for (var i=0;i<a.length ;i++ )
{
document.write(a.next());
}