function isOdd(num) {
  return (num % 2);
}

// fill the items with pictures of the week

function displayPics(week) {   
var today_obj=new Date();
var today_day=today_obj.getDay()+1;
var wn = "week2";
if (isOdd(week)) {
  wn = "week1";
}
var picpath=""
var mainpic = picpath+"imgs/mainpics/"+wn+"/hr"+today_day+".jpg";
document.write("<img border='0' src='"+mainpic+"' align='center' width='310px' ></img>"); 
  
}