function weekNo() {
var totalDays = 0;
now = new Date();
years=now.getYear();
var days = new Array(12);
days[0] = 31;
days[2] = 31;
days[3] = 30;
days[4] = 31;
days[5] = 30;
days[6] = 31;
days[7] = 31;
days[8] = 30;
days[9] = 31;
days[10] = 30;
days[11] = 31;
// is it a leap year
//////////////////////////////////////////////////
// has some year 2000 problem
// should check the year by dividing 4000
//
//////////////////////////////////////////////////
if (Math.round(now.getYear()/4) == now.getYear()/4) {
days[1] = 29
}else{
days[1] = 28
}
// If this is January
if (now.getMonth() == 0) {
totalDays = totalDays + now.getDate();
}else{
var curMonth = now.getMonth();
for (var count = 1; count <= curMonth; count++) {
totalDays = totalDays + days[count - 1];
}
totalDays = totalDays + now.getDate();
}
var agt=navigator.userAgent.toLowerCase();
if ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1)) {
var firstday=new Date("01/01/"+String(now.getYear())).getDay();
}else {
var firstday=new Date("01/01/"+String(1900+now.getYear())).getDay();
}
var diff=7-firstday+1;
var week = Math.round((totalDays+diff-firstday)/7); return week;
}
document.write("Week "+weekNo()+" of "+years)