// JavaScript Document

//checkt of de velden zijn ingevuld
function check_Form(formulier, fields, description) {

	d = document.forms [formulier];
	var errors = "";
	
	for (i=0;i<fields.length;i++){ 
		data_field = fields[i];

		if(d [data_field].length && d [data_field].type!="select-one") { // radio or checkbox and no select?
			array_errors = true;
			for (y=0;y<d [data_field].length;y++) { // get options
				if(d [data_field][y].checked == true) {
					array_errors = false;
				}
			}
			if(array_errors != false){
				errors += "- "+description[i]+"\n";
			}
		}		
		else if(d [data_field].type=="checkbox"){
			if(d [data_field].checked == false){
				errors += "- "+description[i]+"\n";
			}
		}
		else {
			if(d [data_field].value == "") {
				errors += "- "+description[i]+"\n";
			}
		}

		if( d [data_field].name == "email"){
			if( checkEmail("email") == false){
				errors += "- "+description[i]+"\n";
			}
		}
	}
	
	
	if(errors) {
		alert("De volgende veld(en) zijn nog niet (correct) ingevuld:\n"+errors);
		return false;
	}
	else {
		return true;
	}
}


function checkEmail(emailadres) {
	//var email = document.getElementById('emailaddress');
	var email = document.getElementById(emailadres);
	var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(email.value)) {
	//alert('Please provide a valid email address');
	//email.focus
	return false;
	}
	return true;
}

function sh(id) {
	if(document.getElementById(id)) {
		dp=document.getElementById(id).style.display;
		switch(dp+"") {
			case "none": document.getElementById(id).style.display="block"; break;
			case "block": document.getElementById(id).style.display="none"; break;
			case "": document.getElementById(id).style.display="block"; break;
		}
	} else {
		alert(id);	
	}
}