/* 
function: 	validateEmail(sElement)
description:	checks if an input has a valid emailformat
vars:		sElement - id of the input field that will be validated
*/
function validateEmail(sElement) {
	
	var email = document.getElementById(sElement).value;
	
	if (email != "") {
		var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		if (filter.test(email) ) {
			return true;
		} else {
			alert("Het ingevulde e-mailadres is niet in het juiste formaat. Voorbeeld: naam@email.nl");
			return false;
		}
	}
}
/* 
function: 	displaySwitch(sElement, oLink, sTextHidden, sTextVisible) {
description:	toggles the display of an HTML element on or off
vars:		sElement - id of the element that will be shown
		sLink - if of the element which triggered the function
		sTextHidden - innerhtml text of the oLink when sElement is hidden
		sTextVisible - innerhtml text of the oLink when sElement is shown
*/
function displaySwitch(sElement, sLink, sTextHidden, sTextVisible) {
	
	var elToSwitch = document.getElementById(sElement)
	var elLink = document.getElementById(sLink)
  	 	
	if (elToSwitch.style.display != "block") {
		elLink.innerHTML = sTextVisible;
		elToSwitch.style.display = "block";		
	} else {
		elLink.innerHTML = sTextHidden;
		elToSwitch.style.display = "none";
	}
}
/* 
function: 	togglePulldown(sName) {
description:	displays divs depending on sName
vars:		sName - id of the element
*/
function togglePulldown(sName) {
	
	var obj = document.getElementById(sName);
					
	if (sName == "dsmorganisatie") {
		switch (obj.value) {
			case "andere_landelijke_organisatie":
				document.getElementById("provinciaaldiv").style.display = "none";
				document.getElementById("dsmprovinciaal").selectedIndex = 0;
				document.getElementById("andere_landelijke_organisatiediv").style.display = "block";
				break;
			case "provinciaal":
			case "lokaal":
				document.getElementById("provinciaaldiv").style.display = "block";
				document.getElementById("andere_landelijke_organisatiediv").style.display = "none";
				document.getElementById("dsmandere_landelijke_organisatie").selectedIndex = 0;
				break;
			default: 
				document.getElementById("provinciaaldiv").style.display = "none";
				document.getElementById("dsmprovinciaal").selectedIndex = 0;
				document.getElementById("andere_landelijke_organisatiediv").style.display = "none";
				document.getElementById("dsmandere_landelijke_organisatie").selectedIndex = 0;
		}		
	}
}