function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

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 MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

//validate email address
function isValidEmail(strEmail){
	validRegExp = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
	strEmail = strEmail;

	// search email text for regular exp matches
	if (strEmail.search(validRegExp) == -1) {
		return false;
	}
    return true;
}

//validate dutch telephone number
function validTel(string) 
{
	var Chars = "0123456789- ";
	//check chars
	var deLengte = string.length;
	for(var i=0; i<string.length; i++) {
		if(Chars.indexOf(string.charAt(i))==-1)
		return false;
	}
	//length
	if(deLengte<10)
	{
		return(false);
	}
	return true;
}

//validate dutch postal code
function isValidPostcode(postcode) {
	var reg = new RegExp(/([0-9]){4}([A-Z]){2}/);
	if(reg.exec(postcode)==null) {
		return false;
	}
	return true;
}

//validate price
function isValidPrice(price) {
	var reg = new RegExp(/\d+([-+.]\d+)?/);
	if(reg.exec(price)==null) {
		return false;
	}
	return true;
}

//trim value
function trim(value) {
	value = value.replace(/^\s+/,'');
	value = value.replace(/\s+$/,'');
	return value;
}

function reservering()
{
	//fields to be checked
	var my_fields= new Array()
	my_fields["naam"]="Naam";
	my_fields["adres"]="Adres";
	my_fields["postcode"]="Postcode";
	my_fields["plaats"]="Plaats";
	my_fields["telefoon"]="Telefoon";
	my_fields["email"]="Email";

	for(var field in my_fields) {
		//set value
		var value=trim(document.getElementById(field).value);

		//check value
		if(value=="") {
			document.getElementById(field).style.border='1px solid #FF0000';
			document.getElementById(field).focus();
			alert("Het veld '"+my_fields[field]+"' is verplicht");
			return false;
		}else{
			document.getElementById(field).style.border='';
		}

		if(field=="telefoon") {
			if(!validTel(value)) {
				document.getElementById(field).style.border='1px solid #FF0000';
				alert("Het veld '"+my_fields[field]+"' is niet geldig ingevoerd");
				return false;
			}else{
				document.getElementById(field).style.border='';
			}
		}
		
		if(field=="postcode") {
			if(!isValidPostcode(value)) {
				document.getElementById(field).style.border='1px solid #FF0000';
				alert("Het veld '"+my_fields[field]+"' is niet geldig ingevoerd");
				return false;
			}else{
				document.getElementById(field).style.border='';
			}
		}

		if(field=="email") {
			if(!isValidEmail(value)) {
				document.getElementById(field).style.border='1px solid #FF0000';
				alert("Het veld '"+my_fields[field]+"' is niet geldig ingevoerd");
				return false;
			}else{
				document.getElementById(field).style.border='';
			}
		}
	}
	
	//set value
	var field="fax";
	var value=trim(document.getElementById(field).value);

	//check value
	if(value!="") {
		if(!validTel(value)) {
			document.getElementById(field).style.border='1px solid #FF0000';
			alert("Het veld '"+my_fields[field]+"' is niet geldig ingevoerd");
			return false;
		}else{
			document.getElementById(field).style.border='';
		}
	}

	return true;
}

function informatie()
{
	//fields to be checked
	var my_fields= new Array()
	my_fields["naam"]="Naam";
	my_fields["email"]="Email";
	my_fields["bericht"]="Bericht";

	for(var field in my_fields) {
		//set value
		var value=trim(document.getElementById(field).value);

		//check value
		if(value=="") {
			document.getElementById(field).style.border='1px solid #FF0000';
			document.getElementById(field).focus();
			alert("Het veld '"+my_fields[field]+"' is verplicht");
			return false;
		}else{
			document.getElementById(field).style.border='';
		}

		if(field=="email") {
			if(!isValidEmail(value)) {
				document.getElementById(field).style.border='1px solid #FF0000';
				alert("Het veld '"+my_fields[field]+"' is niet geldig ingevoerd");
				return false;
			}else{
				document.getElementById(field).style.border='';
			}
		}
	}

	return true;
}