if (!fcp)
       var fcp = new Object();
if (!fcp.msg)
       fcp.msg = new Object();

fcp.week_days = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"];
fcp.months = ["January", "February", "March", "April", "May", "June",
       "July", "August", "September", "October", "November", "December"];
fcp.msg.prev_year = "Previous year";
fcp.msg.prev_month = "Previous month";
fcp.msg.next_month = "Next month";
fcp.msg.next_year = "Next year";

fcp.Calendar = function(element, show_clock) {
       if (!element.childNodes)
               throw "HTML element expected";
       this.element = element;
       this.selection = new Date();
       this.show_clock = show_clock;
       this.selected_cell = undefined;
       this.generate_month();
       this.render_calendar();
}

fcp.Calendar.prototype.set_date_time = function (date_time) {
       if (date_time.constructor == Date) {
               this.selection = date_time;
               this.generate_month();
               this.render_calendar();
       } else {
               throw "Date object expected (in fcp.Calendar.set_date_time)";
       }
}

fcp.Calendar.prototype.next_month = function () {
       var month = this.selection.getMonth();
       if (month == 11) {
               this.selection.setMonth(0);
               this.selection.setYear(this.selection.getFullYear() + 1);
       } else {
               this.selection.setMonth(month + 1);
       }
       this.generate_month();
       this.render_calendar();
}

fcp.Calendar.prototype.prev_month = function () {
       var month = this.selection.getMonth();
       if (month == 0) {
               this.selection.setMonth(11);
               this.selection.setYear(this.selection.getFullYear() - 1);
       } else {
               this.selection.setMonth(month - 1);
       }
       this.generate_month();
       this.render_calendar();
}

fcp.Calendar.prototype.next_year = function () {
       var is_feb29 = (this.selection.getMonth() == 1)
               && (this.selection.getDate() == 29);
       if (is_feb29) {
               this.selection.setDate(1);
               this.selection.setMonth(2); // March
       }
       this.selection.setFullYear(this.selection.getFullYear() + 1);
       this.generate_month();
       this.render_calendar();
}

fcp.Calendar.prototype.prev_year = function () {
       var is_feb29 = (this.selection.getMonth() == 1)
               && (this.selection.getDate() == 29);
       if (is_feb29) {
               this.selection.setDate(1);
               this.selection.setMonth(2); // March
       }
       this.selection.setFullYear(this.selection.getFullYear() - 1);
       this.generate_month();
       this.render_calendar();
}

fcp.Calendar.prototype.generate_month = function () {
       this.raw_data = new Array();
       var week = 0;
       this.raw_data[week] = new Array(7);

       var first_of_month = fcp.Calendar.clone_date(this.selection);
       first_of_month.setDate(1);
       var first_weekday = first_of_month.getDay();
       // Move Sunday last
       first_weekday = (first_weekday == 0) ? 6 : first_weekday - 1;
       // Fill in the last days from the previous month.
       for (var i = 0; i < first_weekday; i++) {
               this.raw_data[week][i] = 0;
       }

       var last_of_month = fcp.Calendar.days_in_month(
               this.selection.getYear(),
               this.selection.getMonth());
       var weekday = first_weekday;
       for (var i = 1; i <= last_of_month; i++) {
               this.raw_data[week][weekday] = i;
               weekday++;
               if (weekday > 6) {
                       weekday = 0;
                       week++;
                       this.raw_data[week] = new Array(7);
               }
       }

       // Fill in the first days from the next month.
       for (var i = weekday; i < 7; i++) {
               this.raw_data[week][i] = 0;
       }
}

fcp.Calendar.prototype.render_calendar = function () {
       this.element.selected_cell = undefined;
       this.element.innerHTML = "";
       this.element.appendChild(this.render_month());
}

fcp.Calendar.prototype.render_heading = function () {
       var heading = document.createElement("caption");

       var prev_year = document.createElement("a");
       prev_year.href = "#";
       prev_year.calendar = this;
       prev_year.onclick = function() {
               this.calendar.prev_year();
               return false;
       };
       prev_year.innerHTML = "&lt;&lt;";
       prev_year.title = fcp.msg.prev_year;

       var prev_month = document.createElement("a");
       prev_month.href = "#";
       prev_month.calendar = this;
       prev_month.onclick = function() {
               this.calendar.prev_month();
               return false;
       };
       prev_month.innerHTML = "&lt;";
       prev_month.title = fcp.msg.prev_month;

       var month_year = document.createTextNode(
               "\u00a0\u00a0" + fcp.months[this.selection.getMonth()]
               + " " + this.selection.getFullYear() + "\u00a0\u00a0");

       var next_month = document.createElement("a");
       next_month.href = "#";
       next_month.calendar = this;
       next_month.onclick = function() {
               this.calendar.next_month();
               return false;
       };
       next_month.innerHTML = "&gt;";
       next_month.title = fcp.msg.next_month;

       var next_year = document.createElement("a");
       next_year.href = "#";
       next_year.calendar = this;
       next_year.onclick = function() {
               this.calendar.next_year();
               return false;
       };
       next_year.innerHTML = "&gt;&gt;";
       next_year.title = fcp.msg.next_year;

       heading.appendChild(prev_year);
       heading.appendChild(document.createTextNode("\u00a0\u00a0"));
       heading.appendChild(prev_month);
       heading.appendChild(month_year);
       heading.appendChild(next_month);
       heading.appendChild(document.createTextNode("\u00a0\u00a0"));
       heading.appendChild(next_year);
       return heading;
}

fcp.Calendar.prototype.render_month = function() {
       var html_month = document.createElement("table");
       html_month.className = "calendar";
       html_month.appendChild(this.render_heading());

       var thead = document.createElement("thead");
       var tr = document.createElement("tr");
       for (var i = 0; i < fcp.week_days.length; i++) {
               var th = document.createElement("th");
               th.innerHTML =  fcp.week_days[i];
               tr.appendChild(th);
       }
       thead.appendChild(tr);
       html_month.appendChild(thead);

       var tbody = document.createElement("tbody");
       for (var i = 0; i < this.raw_data.length; i++) {
               tbody.appendChild(this.render_week(this.raw_data[i]));
       }
       html_month.appendChild(tbody);
       return html_month;
}

fcp.Calendar.prototype.render_week = function (day_numbers) {
       var html_week = document.createElement("tr");
       html_week.align = "right";
       for (var i = 0; i < 7; i++) {
               html_week.appendChild(this.render_day(day_numbers[i]));
       }
       return html_week;
}

fcp.Calendar.prototype.render_day = function (day_number) {
       var td = document.createElement("td");
       if (day_number >= 1 && day_number <= 31) {
               var anchor = document.createElement("a");
               anchor.href = "#";
               anchor.innerHTML = day_number;
               anchor.calendar = this;
               anchor.date = day_number;
               anchor.onclick = fcp.Calendar.handle_select;
               td.appendChild(anchor);

               if (day_number == this.selection.getDate()) {
                       this.selected_cell = td;
                       td.className = "in_month selected";
               } else {
                       td.className = "in_month";
               }
       }
       return td;
}

// Do nothing by default.
fcp.Calendar.prototype.onselect = function () {}

fcp.Calendar.clone_date = function (date_obj) {
       if (date_obj.constructor != Date)
               throw "Date object expected (in fcp.Calendar.clone_date)";
       else
               return new Date(
                       date_obj.getFullYear(),
                       date_obj.getMonth(),
                       date_obj.getDate(),
                       date_obj.getHours(),
                       date_obj.getMinutes(),
                       date_obj.getSeconds());
}

fcp.Calendar.days_in_month = function (year, month) {
       if (month < 0 || month > 11)
               throw "Month must be between 0 and 11";
       var day_count = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
       if (month != 1) {
               return day_count[month];
       } else if ((year % 4) != 0) {
               return 28;
       } else if ((year % 400) == 0) {
               return 29;
       } else if ((year % 100) == 0) {
               return 28;
       } else {
               return 29;
       }
}

fcp.Calendar.handle_select = function () {
       if (this.calendar.selected_cell)
               this.calendar.selected_cell.className = "in_month";
       this.calendar.selected_cell = this.parentNode;
       this.parentNode.className = "in_month selected";

       this.calendar.selection.setDate(this.date);
       this.calendar.onselect(this.calendar.selection);
       return false;
}


// Created by: Simon Willison
// http://simon.incutio.com/archive/2004/05/26/addLoadEvent
function addLoadEvent(func) {
 var oldonload = window.onload;
 if (typeof window.onload != 'function') {
   window.onload = func;
 } else {
   window.onload = function() {
     if (oldonload) {
       oldonload();
     }
     func();
   }
 }
}
addLoadEvent(function() {
// function() {
initpage();
 //cal = new fcp.Calendar(document.getElementById("cal_placeholder"));
 //cal.onselect = function(date) {alert(date);}; } )
});