// ------------------------------------------------------------------------------------

var oldLink = null;
// code to change the active stylesheet
function setActiveStyleSheet(link, title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
  if (oldLink) oldLink.style.fontWeight = 'normal';
  oldLink = link;
  link.style.fontWeight = 'bold';
  return false;
}

// ------------------------------------------------------------------------------------
// This function gets called when the end-user clicks on some date.
function selected(cal, date) {
  cal.sel.value = date; // just update the date in the input field.
  if (cal.sel.id == "sel1" || cal.sel.id == "sel3")
    // if we add this call we close the calendar on single-click.
    // just to exemplify both cases, we are using this only for the 1st
    // and the 3rd field, while 2nd and 4th will still require double-click.
    cal.callCloseHandler();
}

// ------------------------------------------------------------------------------------
// And this gets called when the end-user clicks on the _selected_ date,
// or clicks on the "Close" button.  It just hides the calendar without
// destroying it.
function closeHandler(cal) {
  cal.hide();                        // hide the calendar
}

// ------------------------------------------------------------------------------------
// This function shows the calendar under the element having the given id.
// It takes care of catching "mousedown" signals on document and hiding the
// calendar if the click was outside.
function showCalendar(id, format) {
  var el = document.getElementById(id);
  if (calendar != null) {
    // we already have some calendar created
    calendar.hide();                 // so we hide it first.
  } else {
    // first-time call, create the calendar.
    var cal = new Calendar(false, null, selected, closeHandler);
    // uncomment the following line to hide the week numbers
    // cal.weekNumbers = false;
    calendar = cal;                  // remember it in the global var
    cal.setRange(1900, 2070);        // min/max year allowed.
    cal.create();
  }
  calendar.setDateFormat(format);    // set the specified date format
  calendar.parseDate(el.value);      // try to parse the text in field
  calendar.sel = el;                 // inform it what input field we use
  calendar.showAtElement(el);        // show the calendar below it

  return false;
}

var MINUTE = 60 * 1000;
var HOUR = 60 * MINUTE;
var DAY = 24 * HOUR;
var WEEK = 7 * DAY;

// ------------------------------------------------------------------------------------
// If this handler returns true then the "date" given as
// parameter will be disabled.  In this example we enable
// only days within a range of 10 days from the current
// date.
// You can use the functions date.getFullYear() -- returns the year
// as 4 digit number, date.getMonth() -- returns the month as 0..11,
// and date.getDate() -- returns the date of the month as 1..31, to
// make heavy calculations here.  However, beware that this function
// should be very fast, as it is called for each day in a month when
// the calendar is (re)constructed.
function isDisabled(date) {
  var today = new Date();
  return (Math.abs(date.getTime() - today.getTime()) / DAY) > 10;
}

// ------------------------------------------------------------------------------------
function flatSelected(cal, date) {
  var el = document.getElementById("preview");
  el.innerHTML = date;
}

// ------------------------------------------------------------------------------------
function showFlatCalendar() {
  var parent = document.getElementById("display");

  // construct a calendar giving only the "selected" handler.
  var cal = new Calendar(false, null, flatSelected);

  // hide week numbers
  cal.weekNumbers = false;

  // We want some dates to be disabled; see function isDisabled above
  cal.weekNumbers = false;

  // We want some dates to be disabled; see function isDisabled above
  cal.setDisabledHandler(isDisabled);
  cal.setDateFormat("DD, M d");

  // this call must be the last as it might use data initialized above; if
  // we specify a parent, as opposite to the "showCalendar" function above,
  // then we create a flat calendar -- not popup.  Hidden, though, but...
  cal.create(parent);

  // ... we can show it here.
  cal.show();
}


// ------------------------------------------------------------------------------------
function toggleChecked() { 

	count = document.frm2.elements.length;
	var mainselect = document.frm1.selectCheck;
	
	if (mainselect.checked) {
		for (i=0; i < count; i++) document.frm1.elements[i].checked= 1;    		
	} else {
		for (i=0; i < count; i++) document.frm1.elements[i].checked= 0;    			
	}
			
} 

// -----------------------------------------------
function askEpstein() {
	
	var f = document.forms['epstein'];
	var question = f.epsteinquestion.value;
	var email = f.email.value;
	
	if (question && email) {
	
		var browser = navigator.appName; 
		if(browser == "Microsoft Internet Explorer"){
			var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		}else{
			/* Create the object using other browser's method */
			var xmlhttp = new XMLHttpRequest();
		}
		
		var myURL = '/uploadquestion.php?q=' + escape(question) + '&email=' + escape(email);
									
		xmlhttp.open("GET", myURL, true);
		xmlhttp.onreadystatechange=function() {
			if (xmlhttp.readyState == 4) { 
				var response = xmlhttp.responseText;
				var dispthanks = document.getElementById('thankyoutext');
				if (response!="Fail") dispthanks.innerHTML = '<center><b>Thank you for your question!</b></center><br>';
				f.epsteinquestion.value = '';
			}
		}
					
		xmlhttp.send(null);
			
	} else {
		alert('You must complete a question AND your email address');	
	}
	
}