var oldLink = null;

// This function gets called when the end-user clicks on some date.
function calendar_selected(cal, date) {
    
    cal.sel.value = date; // just update the date in the input field.
    //if (cal.dateClicked && (cal.sel.id == "sel1" || cal.sel.id == "sel3"))
    if (cal.dateClicked) {
        // 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.
    }
    
}

// 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 calendar_closeHandler(cal) {
    cal.hide();                        // hide the calendar
    //  cal.destroy();
    _dynarch_popupCalendar = null;
}

// 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 calendar_showCalendar(id, format, showsTime, showsOtherMonths) {
    var el = document.getElementById(id);
    if (_dynarch_popupCalendar != null) {
        // we already have some calendar created
        _dynarch_popupCalendar.hide();                 // so we hide it first.
    } else {
    // first-time call, create the calendar.
    var cal = new Calendar(1, null, calendar_selected, calendar_closeHandler);
    // uncomment the following line to hide the week numbers
    // cal.weekNumbers = false;
    if (typeof showsTime == "string") {
        cal.showsTime = true;
        cal.time24 = (showsTime == "24");
    }
    if (showsOtherMonths) {
        cal.showsOtherMonths = true;
    }
    _dynarch_popupCalendar = cal;                  // remember it in the global var
    cal.setRange(1900, 2070);        // min/max year allowed.
    cal.create();
    }
    _dynarch_popupCalendar.setDateFormat(format);    // set the specified date format
    _dynarch_popupCalendar.parseDate(el.value);      // try to parse the text in field
    _dynarch_popupCalendar.sel = el;                 // inform it what input field we use

    // the reference element that we pass to showAtElement is the button that
    // triggers the calendar.  In this example we align the calendar bottom-right
    // to the button.
    _dynarch_popupCalendar.showAtElement(el.nextSibling, "Br");        // show the calendar

    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 calendar_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(0, null, flatSelected);
    
    // hide week numbers
    cal.weekNumbers = false;
    
    // We want some dates to be disabled; see function isDisabled above
    cal.setDisabledHandler(calendar_isDisabled);
    cal.setDateFormat("%A, %B %e");
    
    // 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 calendar_formatData( campo ) {
    var valore = campo.value;    
    if (valore!="") {
        var check = new Boolean();
        check=false;
        var data = new String(valore);
        var dim = new Array();
        dim = data.split("/");
        var giorno = dim[0];
        var mese = dim[1];
        var anno = dim[2];	
        if ( dim.length == 3) check = true;
        if (check) {    
            if ( (giorno >= 1) && (giorno <= 31)  && (check) && (giorno != '')) {
                check = true;
                if (giorno.length<2) giorno = "0" + giorno;		  		  
            } else {
                check=false;
            }
        
            if ( (mese >= 1) && (mese <= 12) && (check) && (mese != '')) {
                check = true;
                if (mese.length<2) mese = "0" + mese;		  		  
            } else {
                check=false;	
            }


            if ( (anno >= 0) && (anno <= 2099) && (check) && (anno != '') && (anno.length>1)){
                check = true; 
                if (anno.length<3) anno = "0" + anno;		  		  
                if (anno.length<4) anno = "2" + anno;		  		  

            } else {
                check=false
            }
        }        
        if (!check) {	        	    	 	        

            alert('Campo ' + campo.name + ' in formato errato (gg/mm/aaaa)');
            //campo.focus();
        } else {
            campo.value = giorno + "/" + mese + "/" + anno;
        }			
    }
}