function checkform(form){

	melding = "";
	
	if(form.b.value.length < 1){ melding = melding + "Achternaam\n"; }
	if(form.i.value.length < 1){ melding = melding + "Bericht\n"; }
	if(form.g.value.length < 1){ melding = melding + "E-mail\n"; }
	if(form.g.value.length > 0){
			var checkEmail = "@.";
			var checkStr = form.g.value;
			var EmailValid = false;
			var EmailAt = false;
			var EmailPeriod = false;
			
			for(i = 0;  i < checkStr.length;  i++){
				ch = checkStr.charAt(i);
				for(j = 0;  j < checkEmail.length;  j++){
					if(ch == checkEmail.charAt(j) && ch == "@")
						EmailAt = true;
					if(ch == checkEmail.charAt(j) && ch == ".")
						EmailPeriod = true;
			  		if(EmailAt && EmailPeriod)
						break;
			  		if(j == checkEmail.length)
						break;
				}
				if(EmailAt && EmailPeriod){
					EmailValid = true
					break;
				}
			}
			if(!EmailValid){
				melding = melding + "E-mail\n";
			}
	}

	if(melding != ""){
		alert("U heeft niet alle velden correct ingevoerd.\nVoert u de volgende velden a.u.b. in:\n\n" + melding);
		return false;    
	}
	else{
		return true;
	}   
}

function checkDatetype(s,eD,fD){
	var box = document.getElementById(s);
	var g = box.options[box.selectedIndex].value;
	
	if(g=='d'){
		document.getElementById(eD).style.display = 'block';
		document.getElementById(fD).style.display = 'none';
	}else{
		document.getElementById(eD).style.display = 'none';
		document.getElementById(fD).style.display = 'block';
	}
}

var speed = 0;
var height = -605;
var direction = '';
var step = 5;
var maxa = -10000;

function moveflashcard(){	
/*
	if(((document.getElementById('map-container').offsetTop < 0) || (direction == '')) && (direction != 'in')){
		if(direction == ''){ 
			direction = 'out'; 
		} 
		document.getElementById('map-container').style.top = document.getElementById('map-container').offsetTop+step+'px';
		if(document.getElementById('map-container').offsetTop == -3){
			clearTimeout(id);
			direction = 'in';
		}else{ 
			id = setTimeout("moveflashcard()",speed); 
		}
	}else{
		if(direction == 'out'){ 
			direction = 'in'; 
		} 
		if(direction == 'in'){  
			document.getElementById('map-container').style.top = document.getElementById('map-container').offsetTop-step+'px';
			if(document.getElementById('map-container').offsetTop == height){
				clearTimeout(id);
				direction = 'out';
			}else{
				id = setTimeout("moveflashcard()",speed);
			}
		}
	}
*/
}

function MM_swapImgRestore(){
	if(document.MM_swapImgData != null)
	for(var i=0; i<(document.MM_swapImgData.length-1); i+=2)
	document.MM_swapImgData[i].src = document.MM_swapImgData[i+1];
}

function MM_preloadImages(){
	if(document.images){
		var imgFiles = MM_preloadImages.arguments;
		if(document.preloadArray==null) document.preloadArray = new Array();
		var i = document.preloadArray.length;
		with (document) for (var j=0; j<imgFiles.length; j++) if (imgFiles[j].charAt(0)!="#"){
			preloadArray[i] = new Image;
			preloadArray[i++].src = imgFiles[j];
  		} 		
  	}
}

function MM_swapImage(){
	var i,j=0,objStr,obj,swapArray=new Array,oldArray=document.MM_swapImgData;
	for (i=0; i < (MM_swapImage.arguments.length-2); i+=3){
		objStr = MM_swapImage.arguments[(navigator.appName == 'Netscape')?i:i+1];
		if((objStr.indexOf('document.layers[')==0 && document.layers==null) ||
		(objStr.indexOf('document.all[')==0 && document.all==null))
		objStr = 'document'+objStr.substring(objStr.lastIndexOf('.'),objStr.length);
		obj = eval(objStr);
		if(obj != null){
			swapArray[j++] = obj;
			swapArray[j++] = (oldArray==null || oldArray[j-1]!=obj)?obj.src:oldArray[j];
			obj.src = MM_swapImage.arguments[i+2];
		} 
	}
	document.MM_swapImgData = swapArray;
}

function myPreloader(id){}

function question(txt,url){
	msgAnswer = confirm(txt);
	
	if(msgAnswer==true){
		top.document.location.href=url;	
	}
}

function checkExt(node){
	if(node.value != ""){	
		var ext_end = node.value.lastIndexOf('.');
		var ext_substr = node.value.substring(ext_end+1);
		
		switch(ext_substr.toLowerCase()){
				case "pdf":							
				break			
				default :				
				alert('U kunt alleen PDF bestanden uploaden!')	
				node.value = ""							
		}
	}
}

function checkExt2(node){
	if(node.value != ""){	
		var ext_end = node.value.lastIndexOf('.');
		var ext_substr = node.value.substring(ext_end+1);
		
		switch(ext_substr.toLowerCase()){
				case "jpg":							
				break			
				default :				
				alert('U kunt alleen JPG bestanden uploaden!')	
				node.value = ""							
		}
	}
}

function closeMenu(){
	for(var i=0; i<arguments.length; i++){
		document.getElementById(arguments[i]).style.display = 'none';
	}
}

function openMenu(){
	for(var i=0; i<arguments.length; i++){
		document.getElementById(arguments[i]).style.display = 'block';
	}
}

function toggleMenu(a,b,c){
	document.getElementById(a).style.display = 'block';
	document.getElementById(b).style.display = 'none';
	document.getElementById(c).style.display = 'none';
}

function toggleMenuWerkzaamheden(a,b,c,d,e){
	document.getElementById(a).style.display = 'block';
	document.getElementById(b).style.display = 'none';
	document.getElementById(c).style.display = 'none';
	document.getElementById(d).style.display = 'none';
	document.getElementById(e).style.display = 'none';
}

function toggleMenuFaq(a,b,c,d,e,f,g){
	document.getElementById(a).style.display = 'block';
	document.getElementById(b).style.display = 'none';
	document.getElementById(c).style.display = 'none';
	document.getElementById(d).style.display = 'none';
	document.getElementById(e).style.display = 'none';
	document.getElementById(f).style.display = 'none';
	document.getElementById(g).style.display = 'none';
}

function popUp(URL){
	id = 'popup';
	eval("page" + id + " = window.open(URL,'" + id + "','toolbar=0,scrollbars=1,location=0,statusbar=1,menubar=0,resizable=0,width=400,height=400');");
}

function popCMS(URL){
	id = 'popupcms';
	eval("page" + id + " = window.open(URL,'" + id + "','toolbar=0,scrollbars=1,location=0,statusbar=1,menubar=0,resizable=0,width=400,height=400');");
}

function openPopup(URL){
	id = 'newwindow';
	eval("page" + id + " = window.open(URL,'" + id + "','');");
}

function slide_picture_to(number){  
	//Define duration
	//document.slide_picture.style.filter="blendTrans(duration=1)";
	//document.slide_picture.filters.blendTrans.Apply(); 
	//Define picture
	document.slide_picture.src = number;
	//document.slide_picture.filters.blendTrans.Play();
}