function r(l,h,s) {
var n=new Date();
var r=71*(n.getTime()/((n.getSeconds()+1)*s));
r=l+Math.floor(r%(h+1-l));
return r;
}
function changeOpac(opacity, id) { //change the opacity for different browsers
var object = document.getElementById(id).style;
object.opacity = (opacity / 100);
object.MozOpacity = (opacity / 100);
object.KhtmlOpacity = (opacity / 100);
object.filter = "alpha(opacity=" + opacity + ")";
}
// samples..
x=r(0,3,6);