var Toggle = 0;	//when 0 = display calendar, 1 = ignore

function positionInfo(object) 
{

  var p_elm = object;

  this.getElementLeft = getElementLeft;
  
  function getElementLeft() 
  {
    var x = 0;
    var elm;
    
    if(typeof(p_elm) == "object")
    {
      elm = p_elm;
    } 
    else 
    {
      elm = document.getElementById(p_elm);
    }
    
    while (elm != null) 
    {
      x+= elm.offsetLeft;
      elm = elm.offsetParent;
    }
    
    return parseInt(x);
  }

  this.getElementWidth = getElementWidth;
  
  function getElementWidth()
  {
    var elm;
    
    if(typeof(p_elm) == "object")
    {
      elm = p_elm;
    } 
    else 
    {
      elm = document.getElementById(p_elm);
    }
    
    return parseInt(elm.offsetWidth);
  }

  this.getElementRight = getElementRight;
  
  function getElementRight()
  {
    return getElementLeft(p_elm) + getElementWidth(p_elm);
  }

  this.getElementTop = getElementTop;
  
  function getElementTop() 
  {
    var y = 0;
    var elm;
    
    if(typeof(p_elm) == "object")
    {
      elm = p_elm;
    } 
    else 
    {
      elm = document.getElementById(p_elm);
    }
    
    while (elm != null) 
    {
      y+= elm.offsetTop;
      elm = elm.offsetParent;
    }
    
    return parseInt(y);
  }

  this.getElementHeight = getElementHeight;
  
  function getElementHeight()
  {
    var elm;
    
    if(typeof(p_elm) == "object")
    {
      elm = p_elm;
    } 
    else 
    {
      elm = document.getElementById(p_elm);
    }
    
    return parseInt(elm.offsetHeight);
  }

  this.getElementBottom = getElementBottom;
  
  function getElementBottom()
  {
    return getElementTop(p_elm) + getElementHeight(p_elm);
  }
  
}

function CalendarControl() 
{

  var calendarId = 'CalendarControl';	//the div tag that holds our calendar
  var currentYear = 0;
  var currentMonth = 0;
  var currentDay = 0;

  var selectedYear = 0;
  var selectedMonth = 0;
  var selectedDay = 0;

  var months = ['January','February','March','April','May','June','July','August','September','October','November','December'];
  var dateField = null;

  function getProperty(p_property)
  {
    var p_elm = calendarId;
    var elm = null;

    if(typeof(p_elm) == "object")
    {
      elm = p_elm;
    } 
    else 
    {
      elm = document.getElementById(p_elm);
    }
    
    if (elm != null)
    {
      if(elm.style)
      {
        elm = elm.style;
        if(elm[p_property])
        {
          return elm[p_property];
        } 
        else 
        {
          return null;
        }
      } 
      else 
      {
        return null;
      }
    }
  }

  function setElementProperty(p_property, p_value, p_elmId)
  {
    var p_elm = p_elmId;
    var elm = null;

    if(typeof(p_elm) == "object")
    {
      elm = p_elm;
    } 
    else 
    {
      elm = document.getElementById(p_elm);
    }
    
    if((elm != null) && (elm.style != null))
    {
      elm = elm.style;
      elm[ p_property ] = p_value;
    }
  }

  function setProperty(p_property, p_value) 
  {
    setElementProperty(p_property, p_value, calendarId);
  }

  function getDaysInMonth(year, month) 
  {
    return [31,((!(year % 4 ) && ( (year % 100 ) || !( year % 400 ) ))?29:28),31,30,31,30,31,31,30,31,30,31][month-1];
  }

  function getDayOfWeek(year, month, day) 
  {
    var date = new Date(year,month-1,day)
    return date.getDay();
  }

  this.setDate = setDate;
    
  function setDate(year, month, day) 
  {
    if (dateField) 
    {
      if (month < 10) {month = "0" + month;}
      if (day < 10) {day = "0" + day;}

      var dateString = month+"-"+day+"-"+year;
      dateField.value = dateString;
      hide();
    }
    return;
  }

  this.changeMonth = changeMonth;
  
  //change the month currently being displayed
  function changeMonth(change) 
  {
    currentMonth += change;
    currentDay = 0;
    
    if(currentMonth > 12) 
    {
      currentMonth = 1;
      currentYear++;
    } 
    else if(currentMonth < 1) 
    {
      currentMonth = 12;
      currentYear--;
    }

    calendar = document.getElementById(calendarId);
    calendar.innerHTML = calendarDrawTable();
    dateField.focus(); //set focus to text area after the change
  }

  this.changeYear = changeYear;
  
  //change the year currently being displayed
  function changeYear(change) 
  {
    currentYear += change;
    currentDay = 0;
    calendar = document.getElementById(calendarId);
    calendar.innerHTML = calendarDrawTable();
    dateField.focus(); //set focus to text area after the change
  }

  function getCurrentYear() 
  {
    var year = new Date().getYear();
    
    if(year < 1900) 
		year += 1900;
		
    return year;
  }

  function getCurrentMonth() 
  {
    return new Date().getMonth() + 1;
  } 

  function getCurrentDay() 
  {
    return new Date().getDate();
  }

  function calendarDrawTable() 
  {
    var dayOfMonth = 1;
    var validDay = 0;
    var startDayOfWeek = getDayOfWeek(currentYear, currentMonth, dayOfMonth);
    var daysInMonth = getDaysInMonth(currentYear, currentMonth);
    var css_class = null; //CSS class for each day

    var table = "<table cellspacing='0' cellpadding='0' border='0'>";
    table = table + "<tr class='header'>";
    table = table + "  <td colspan='2' class='previous'><a href='javascript:changeCalendarControlMonth(-1);'>&lt;</a> <a href='javascript:changeCalendarControlYear(-1);'>&laquo;</a></td>";
    table = table + "  <td colspan='3' class='title'>" + months[currentMonth-1] + "<br>" + currentYear + "</td>";
    table = table + "  <td colspan='2' class='next'><a href='javascript:changeCalendarControlYear(1);'>&raquo;</a> <a href='javascript:changeCalendarControlMonth(1);'>&gt;</a></td>";
    table = table + "</tr>";
    table = table + "<tr><th>S</th><th>M</th><th>T</th><th>W</th><th>T</th><th>F</th><th>S</th></tr>";

    for(var week=0; week < 6; week++) 
    {
      table = table + "<tr>";
      
      for(var dayOfWeek=0; dayOfWeek < 7; dayOfWeek++) 
      {
        if(week == 0 && startDayOfWeek == dayOfWeek) 
        {
          validDay = 1;
        } 
        else if (validDay == 1 && dayOfMonth > daysInMonth) 
        {
          validDay = 0;
        }

        if(validDay) 
        {
          if (dayOfMonth == selectedDay && currentYear == selectedYear && currentMonth == selectedMonth) 
          {
            css_class = 'current';
          } 
          else if (dayOfWeek == 0 || dayOfWeek == 6) 
          {
            css_class = 'weekend';
          } 
          else 
          {
            css_class = 'weekday';
          }

          table = table + "<td><a class='"+css_class+"' href=\"javascript:setCalendarControlDate("+currentYear+","+currentMonth+","+dayOfMonth+")\">"+dayOfMonth+"</a></td>";
          dayOfMonth++;
        } 
        else 
        {
          table = table + "<td class='empty'>&nbsp;</td>";
        }
      }
      table = table + "</tr>";
    }

    table = table + "<tr class='header'><th colspan='7' style='padding: 3px;'><a href='javascript:hideCalendarControl();'>Close</a></td></tr>";
    table = table + "</table>";

    return table;
  }

  this.show = show;
  
  function show(field) 
  {
  
    // If the calendar is visible and associated with
    // this field do not do anything.
    if (dateField == field) 
    {
      return;
    } 
    else 
    {
      dateField = field;
    }

    if(dateField) 
    {
      try 
      {
        var dateString = new String(dateField.value);
        var dateParts;
        
        if(dateString.indexOf("-") != -1)
        {
			dateParts = dateString.split("-");
        }
        else
        {
			dateParts = dateString.split("/");
        }
        
        selectedMonth = parseInt(dateParts[0],10);
        selectedDay = parseInt(dateParts[1],10);
        selectedYear = parseInt(dateParts[2],10);
      } 
      catch(e) {}
    }

    if (!(selectedYear && selectedMonth && selectedDay)) 
    {
      selectedMonth = getCurrentMonth();
      selectedDay = getCurrentDay();
      selectedYear = getCurrentYear();
    }

    currentMonth = selectedMonth;
    currentDay = selectedDay;
    currentYear = selectedYear;

    if(document.getElementById)
    {

      calendar = document.getElementById(calendarId);
      calendar.innerHTML = calendarDrawTable(currentYear, currentMonth);

      setElementProperty('display', 'block', 'CalendarControlIFrame');
      setProperty('display', 'block');

      var fieldPos = new positionInfo(dateField);
      var calendarPos = new positionInfo(calendarId);

      var x = fieldPos.getElementLeft();
      var y = fieldPos.getElementBottom();

      setProperty('left', x + "px");
      setProperty('top', y + "px");
      setElementProperty('left', x + "px", 'CalendarControlIFrame');
      setElementProperty('top', y + "px", 'CalendarControlIFrame');
      setElementProperty('width', calendarPos.getElementWidth() + "px", 'CalendarControlIFrame');
      setElementProperty('height', calendarPos.getElementHeight() + "px", 'CalendarControlIFrame');
    }
  }

  this.hide = hide;
  
  //hides the calendar
  function hide() 
  {	
	//if a text field is assigned to it
    if(dateField) 
    {
		Toggle = 1; //don't show calendar on next focus
		dateField.focus(); //set focus to text area after the change
		setProperty('display', 'none');
		setElementProperty('display', 'none', 'CalendarControlIFrame');      
		dateField = null;
    }
  }
  
  this.refresh = refresh;
  
  //hides the calendar
  function refresh() 
  {	
	hide();
	Toggle = 0;
  }
}

var calendarControl = new CalendarControl();

//hides the calendar control
function hideCalendarControl() 
{
	calendarControl.hide();
}

//sets the date of the control, which happens any time a date is selected
function setCalendarControlDate(year, month, day)
{
	calendarControl.setDate(year, month, day);
}

//changes the year of the control
function changeCalendarControlYear(change) 
{
	calendarControl.changeYear(change);
}

//changes the month of the control
function changeCalendarControlMonth(change) 
{
	calendarControl.changeMonth(change);
}

//displays the calendar control
function showCalendarControl(textField) 
{	
	
	//if control is read only
	//if(document.getElementById(textField.name).getAttribute("readonly")){return;}
		
	//if we can display the calendar
	if(Toggle == 0)
	{
		calendarControl.show(textField);
	}
	
	Toggle = 0; //display the calendar on next focus
}

document.write("<iframe id='CalendarControlIFrame' src='javascript:false;' frameBorder='0' scrolling='no'></iframe>");
document.write("<div id='CalendarControl'></div>");


/********************WILL RODRIGUEZ*****************************/
//if netscape
if (document.layers) 
{
	document.write("<script>document.captureEvents(Event.KEYDOWN);</script>");
}

document.write("<script>document.onkeydown = RefreshCalendar;</script>");


//determines whether calendar should be hidden due a focus change
function RefreshCalendar()
{
	var key;
	
	if(document.layers)
		key = e.which;
	else
		key = event.keyCode;
		
	//if tab key was pressed
	if(key == 9)
	{
		calendarControl.refresh();
	}
}
/*****************************************************/