var minYear=1900;
var maxYear=2100;
var MM_returnValue = false;

function secondmenu(id1,id2)
{
	if (document.getElementById(id1).style.display=='none')
	{
		var tmparray=document.getElementById('tmpmenu').value.split(",");
		
		for (var i=0;i<tmparray.length;i+=2)
		{
			document.getElementById(tmparray[i]).style.display='none';
			document.getElementById(tmparray[i+1]).className='linkclose';
		}
		document.getElementById(id1).style.display='block';
		document.getElementById(id2).className='linkopen';
	}
	else
	{
		document.getElementById(id1).style.display='none';
		document.getElementById(id2).className='linkclose';
	}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

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, descr)
{
	errors=''; 
	dtCh='-';
	if(dtStr.indexOf("/") > 0)
	{	var dtCh= "/";}
	else if (dtStr.indexOf("-") > 0)
	{	var dtCh= "-";}
	else if (dtStr.indexOf("\\") > 0)
	{	var dtCh= "\\";}
	else if (dtStr.indexOf("_") > 0)
	{	var dtCh= "_";}	
	else if (dtStr.indexOf(".") > 0)
	{	var dtCh= ".";}

	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){
		errors='- '+descr+' moet als dd-mm-jjjj ingevuld worden\n';
		return errors;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		errors='- '+descr+' moet een geldige geldige dag bevatten\n';
		return errors;
	}
	if (strMonth.length<1 || month<1 || month>12){
		errors='- '+descr+' moet een geldige maand bevatten\n';
		return errors;
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		errors='- '+descr+' moet een 4-tallig jaartal tussen  '+minYear+' en '+maxYear+' bevatten\n';
		return errors;
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		errors='- '+descr+' moet een geldige datum zijn\n';
		return errors;
	}
	return errors;
}

function MM_validateForm() 
// gebruik: MM_validateForm(<veldnaam>, <omschrijving>, , check)
// 	deel tussen haken kan herhaald worden
//	check kan zijn: 
//		isDate, RisDate = datum, datum (verplicht)
//		isMail, RisMail = mailadres, mailadres (verplicht)
//		RinRange x:y = tussen x en y
//		R
{ //v4.0
	var i,p,q,nm,test,descr,trgt,num,min,max,errors='',args=MM_validateForm.arguments;
	var isFirst = true;
	for (i=0; i<(args.length-3); i+=4) 
	{ 
		test=args[i+3]; 
		descr=args[i+1]; 
		val=MM_findObj(args[i]);
		if (val) { 
			nm=val.name; if ((val=val.value)!="") {
			if (test.indexOf('isEmail')!=-1) 
			{ 
				p=val.indexOf('@');
				if (p<1 || p==(val.length-1)) 
					errors+='- '+descr+' moet een e-mailadres bevatten.\n';
			} 
			else if (test.indexOf('isDate')!=-1)
			{
				errors+=isDate(val, descr)
			}
			else if (test=='CompDate')
			{
				if (Date.parse(MM_findObj(args[i]).value) >= Date.parse(MM_findObj(args[i+2]).value))
				{
					p=descr.indexOf(':');
					errors+='- De '+descr.substring(0,p)+' moet voor de '+descr.substring(p+1)+' liggen.\n';
				}
			}
			else if (test!='R') 
			{ 
				num = parseFloat(val);
				if (isNaN(val)) 
					errors+='- '+descr+' moet een getal zijn.\n';
				if (test.indexOf('inRange') != -1) 
				{ 
					p=test.indexOf(':');
					min=test.substring(8,p); 
					max=test.substring(p+1);
					if (num<min || max<num) 
						errors+='- '+descr+' moet een getal tussen '+min+' en '+max+' zijn.\n';
				}
			} 
		} 
		else if (test.charAt(0) == 'R') 
			errors += '- '+descr+' is verplicht.\n'; }	
		if ((errors) && (isFirst))
		{
			trgt = MM_findObj(args[i]);
			isFirst = false;
		}
  	} if (errors) 
  	{
  		alert('De volgende fouten zijn in het formulier gevonden:\n'+errors);
		trgt.focus(); trgt.select();
	}
 	document.MM_returnValue = (errors == '');
}