var months = new Array("01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12"); 
var daysInMonth = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); 
var days = new Array("zo","ma", "di", "wo", "do", "vrij", "za"); 
var today; 

document.writeln("<div id='calendar_div' style='position:absolute; z-index:1; visibility: hidden;'></div>");

function getDays(month, year)
{ 
    //maanden en jaren kombineren
    if (1 == month) 
        return ((0 == year % 4) && (0 != (year % 100))) || (0 == year % 400) ? 29 : 28; 
    else 
        return daysInMonth[month]; 
} 

function getToday() 
{ 
    //dag van vandaag 
    this.now = new Date(); 
    this.year = this.now.getFullYear(); 
    this.month = this.now.getMonth(); 
    this.day = this.now.getDate(); 
}

function getStringDay(str) 
{ 
    //geen idee
    var str=str.split("-")
    
    this.now = new Date(parseFloat(str[0]),parseFloat(str[1])-1,parseFloat(str[2])); 
    this.year = this.now.getFullYear(); 
    this.month = this.now.getMonth(); 
    this.day = this.now.getDate(); 
}

function LZ(x) { return (x>=10||x<0?"":"0") + x }

function newCalendar(datestart, dateend) 
{ 
	var parseYear 						= parseInt(document.getElementById('Year').options[document.getElementById('Year').selectedIndex].value);
	var newCal 							= new Date(parseYear, document.getElementById('Month').selectedIndex, 1); 
    var day 							= -1; 
    var startDay 						= newCal.getDay(); 
    var daily 							= 0; 

	//// renske
	var datestart_brokenstring = datestart.split("-");
	var dateend_brokenstring = dateend.split("-");
	
	var firstyear = datestart_brokenstring[0];
	var lastyear = dateend_brokenstring[0];

	var firstmonth = datestart_brokenstring[1] - 1;
	var lastmonth = dateend_brokenstring[1] - 1;
	
	var firstday = datestart_brokenstring[2];
	var lastday = dateend_brokenstring[2];
	
	var date_start = new Date(firstyear,firstmonth,firstday)
	var date_end = new Date(lastyear,lastmonth,lastday)
	
	//alert (firstyear+' : '+firstmonth+' : '+firstday);
	//alert (lastyear+' : '+lastmonth+' : '+date_end);
	//alert (date_start+' : '+date_end);
	//// einde renske

	   
    if ((today.year == newCal.getFullYear()) &&(today.month == newCal.getMonth()))
	{
        day 							= today.day;
	}
    var tableCal 						= document.getElementById('calendar_table'); 
    var intDaysInMonth 					= getDays(newCal.getMonth(), newCal.getFullYear());

	for (var intWeek = 1; intWeek < tableCal.rows.length;intWeek++)
	{
        for (var intDay = 0;intDay < tableCal.rows[intWeek].cells.length;intDay++) 
        { 
            var cell = tableCal.rows[intWeek].cells[intDay]; 
            if ((intDay == startDay) && (0 == daily))
			{
                daily = 1; 
			}
			 
			var date_uit_k = new Date(document.getElementById('Year').value,LZ((document.getElementById('Month').value) - 1),LZ(daily));

            if ((daily > 0) && (daily <= intDaysInMonth)) 
            { 
				//alert (date_uit_k + ' > ' + date_start + ' > ' + date_end);
				if (date_uit_k.getTime() >= date_start.getTime() && date_uit_k.getTime() <= date_end.getTime())
				{
					cell.style.color		= '#FFFFFF';
					cell.style.cursor		= 'pointer';
					cell.style.background	= '#b3b3b3';	
				}
				else
				{
					cell.style.color 		= '#B3B3B3';
					cell.style.cursor		= '';
					cell.style.background	= '';
				}
				cell.innerText 				= daily; 
                daily++; 
            } 
            else
			{
                cell.style.color			= '#B3B3B3';
				cell.style.cursor			= '';
				cell.style.background		= '';
				cell.innerText 				= ''; 
			}
		}
	}
} 

function GetDate(InputBox)
{ 
	var sDate; 
	var dag_ophalen; 
	var maand_ophalen; 
	var jaar_ophalen; 
    //aaasas
    if (event.srcElement.tagName == "TD") 
	{
        if (event.srcElement.innerText != "") 
        { 
			if (event.srcElement.style.cursor == 'pointer')
			{
				sDate = document.getElementById('Year').value + "-" + document.getElementById('Month').value + "-" + event.srcElement.innerText;

				if (document.getElementById('Month').value < 10) maand_val=("0" + document.getElementById('Month').value);
				else maand_val = document.getElementById('Month').value;
				
				if (event.srcElement.innerText < 10) dag_val=("0" + event.srcElement.innerText);
				else dag_val = event.srcElement.innerText;
				
				sDate_input = dag_val + "-" + maand_val + "-" + document.getElementById('Year').value;
				
				document.forms['post'].transactiedatum.value = sDate_input;
				HiddenCalendar();
			}
        } 
	}
} 

function HiddenCalendar()
{
    //asasas
    document.getElementById('calendar_div').style.visibility='hidden';
}

function ShowCalendar(InputBox, datestart, dateend)
{
	var x,y,intLoop,intWeeks,intDays;
    var DivContent;
    var year,month,day;
	var o = document.getElementById(InputBox);
    //var o=eval("document.all."+InputBox);
    var thisyear; //asas
    
    thisyear=new getToday();
    thisyear=thisyear.year;
    
    today = o.value;
    if(isDate(today))
        today = new getStringDay(today);
    else
        today = new getToday(); 
    
    //positie
    x=o.offsetLeft;
    y=o.offsetTop;
    while(o=o.offsetParent)
    {
        x+=o.offsetLeft;
        y+=o.offsetTop;
    }
	document.getElementById('calendar_div').style.left=x+100;
    document.getElementById('calendar_div').style.top=y+5;
    document.getElementById('calendar_div').style.visibility="visible";
	
    
    //asas(border-color:#9DBAF7)
    DivContent="<table border='0' cellspacing='0' style='border:1px solid #FFFFFF; background-color:#D2D2D2'>";
    DivContent+="<tr>";
    DivContent+="<td style='border-bottom:1px solid #FFFFFF; background-color:#3398cc; padding: 5px;'>";
    
    //pulldown jaar
    DivContent+="<select name='Year' id='Year' onChange='newCalendar(\"" + datestart + "\", \"" + dateend + "\")' class='kalender_pulldown_jaar'>";
    for (intLoop = thisyear; intLoop < (thisyear + 1); intLoop++) 
        DivContent+="<option value= " + intLoop + " " + (today.year == intLoop ? "Selected" : "") + ">" + intLoop + "</option>"; 
    DivContent+="</select>";
    
    //pulldown maand
    DivContent+="<select name='Month' id='Month' onChange='newCalendar(\"" + datestart + "\", \"" + dateend + "\")' class='kalender_pulldown_maand'>";
    
	for (intLoop = 0; intLoop < months.length; intLoop++) 
        DivContent+="<option value= " + (intLoop + 1) + " " + (today.month == intLoop ? "Selected" : "") + ">" + months[intLoop] + "</option>"; 
    
	DivContent+="</select>";
    
    DivContent+="</td>";
    
    DivContent+="<td style='border-bottom:1px solid #FFFFFF; background-color:#3398cc; font-family:Arial black; font-size:12px; padding-right:8px; color:#FFFFFF; cursor:pointer' align='center' title='hide' onClick='javascript:HiddenCalendar()'>X</td>";
    DivContent+="</tr>";
     
    DivContent+="<tr><td align='center' colspan='2'>";
    DivContent+="<table id='calendar_table' border='0' width='100%'>";
    
    //weekdagen tonen
    DivContent+="<tr>";
    for (intLoop = 0; intLoop < days.length; intLoop++) 
        DivContent+="<td align='center'>" + days[intLoop] + "</td>"; 
    DivContent+="</tr>";
    
    //asas
    for (intWeeks = 0; intWeeks < 6; intWeeks++)
    { 
        DivContent+="<tr>"; 
        for (intDays = 0; intDays < days.length; intDays++) 
		{
			DivContent+="<td onClick='GetDate(\"" + InputBox + "\");' style='border-right:1px solid #BBBBBB; border-bottom:1px solid #BBBBBB; color:#FFFFFF;' align='center'></td>"; 
		}
		DivContent+="</tr>"; 
    } 
    DivContent+="</table></td></tr></table>";

    document.getElementById('calendar_div').innerHTML=DivContent;
    newCalendar(datestart, dateend);
}

function isDate(dateStr)
{ 
    var datePat = /^(\d{4})(\-)(\d{1,2})(\-)(\d{1,2})$/;
    var matchArray = dateStr.match(datePat);
    if (matchArray == null) return false; 
    var month = matchArray[3];
    var day = matchArray[5]; 
    var year = matchArray[1]; 
    if (month < 1 || month > 12) return false; 
    if (day < 1 || day > 31) return false; 
    if ((month==4 || month==6 || month==9 || month==11) && day==31) return false; 
    if (month == 2)
    {
        var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); 
        if (day > 29 || (day==29 && !isleap)) return false; 
    } 
    return true;
}