/**
 * DHTML date validation script for dd/mm/yyyy. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var dtCh= ".";
var minYear=1900;
var maxYear=2200;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		//alert("The date format should be : dd.mm.yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		//alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		//alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		//alert("Please enter a valid date")
		return false
	}
return true
}

function initCalendar(field)
{
	var f = document.getElementById('date_from'+field);
	eval('cal'+field).select(f, 'date_from'+field, 'dd.MM.yyyy');
}
	
function validate(form, nid)
{	//return true;
	with(form)
	{
		var d = form.date_from.value;
		
		var date_error = false;
		if(d.length > 0)
		{
			var arr = d.split('.');
			if ((arr[0].length > 2 || arr[0].length < 1) || (arr[1].length > 2 ||  arr[1].length < 1)  || arr[2].length != 4){
				date_error = true;
			}
			else
			{
				if(isDate(d)==false)
				{
					date_error = true;
				}
				
				// This instruction will create a date object
				/*
			   source_date = new Date(arr[2],arr[1],arr[0]);

			   if(arr[2] != source_date.getFullYear())
			   {
				  //alert('Year is not valid!');
				  date_error = true;
			   }

			   if(arr[1] != source_date.getMonth())
			   {
				  //alert('Month is not valid!');
				  date_error = true;
			   }

			   if(arr[0] != source_date.getDate())
			   {
				  //alert('Day is not valid!');
				  date_error = true;
			   }*/

			}
		}
		else
		{
			date_error = true;
		}
		
		if(date_error == true)
		{
			form.date_from.className = 'field_error';
			return false;
		}		
		 
		setToDate(nid);
	}
}

function setToDate(nid)
{
	var f0 = document.forms['bForm' + nid].date_from;
	var f1 =  document.forms['bForm' + nid].date_to;
	var s = document.forms['bForm' + nid].package;

	var d = f0.value;
	arr = d.split('.');

	var days = s.value.substring(0, 1);
	days = parseInt(days);
	arr[0] = parseInt(arr[0]);
	var t = new Date(arr[2], arr[1], (arr[0] + days));
	var dt = t.getDate() + '.' + t.getMonth() + '.' + t.getFullYear();
	f1.value = dt;
}