var expdate = new Date();
var num_visits;
//var imgdir = "/img/index/cover/";
//var coverhtml1 = "<img src='" + imgdir;
//var coverhtml2 = ".jpg' />";

expdate.setTime(expdate.getTime() + (5*24*60*60*1000));
if(!(num_visits = GetCookie("num_visits")))
num_visits = 0;
num_visits++;

if(num_visits <= 1){
SetCookie("num_visits", num_visits, expdate);
} else {SetCookie("num_visits", 0, expdate);}

//document.write(coverhtml1 + num_visits + coverhtml2);
document.write('<div style="clear:left; float:left; width:760px; height:200px; background:url(/img/index/cover/' + num_visits + '.jpg) no-repeat"></div>');