<!--
function verbergElement (elementId) {
	var element;
	if (document.all)
		element = document.all[elementId];
	else if (document.getElementById)
		element = document.getElementById(elementId);
	if (element && element.style)
		element.style.display = 'none';
}

function toonElement (elementId) {
	var element;
	if (document.all)
		element = document.all[elementId];
	else if (document.getElementById)
		element = document.getElementById(elementId);
	if (element && element.style)
		element.style.display = '';
}

function check_email(strEmailAddr) {	
	if (strEmailAddr.indexOf('@') == -1){
			alert('Email adres ' + strEmailAddr + ' is geen geldig adres!');
	   return false;
	}
	
	if (strEmailAddr.indexOf('@') == -1 || strEmailAddr.indexOf('@') == 0 || strEmailAddr.indexOf('@') == strEmailAddr.length) {
			alert('Email adres ' + strEmailAddr + ' is geen geldig adres!');
	   return false;
	}
	
	if (strEmailAddr.indexOf('.') ==- 1 || strEmailAddr.indexOf('.') == 0 || strEmailAddr.indexOf('.') == strEmailAddr.length) {
			alert('Email adres ' + strEmailAddr + ' is geen geldig adres!');
	    return false;
	}
	
	if (strEmailAddr.indexOf('@', (strEmailAddr.indexOf('@') + 1)) != -1) {
			alert('Email adres ' + strEmailAddr + ' is geen geldig adres!');
	    return false;
	}
	
	if (strEmailAddr.substring(strEmailAddr.indexOf('@') - 1, strEmailAddr.indexOf('@')) == '.' || strEmailAddr.substring(strEmailAddr.indexOf('@') + 1, strEmailAddr.indexOf('@') + 2) == '.'){
			alert('Email adres ' + strEmailAddr + ' is geen geldig adres!');
	    return false;
	}
	
	if (strEmailAddr.indexOf('.', (strEmailAddr.indexOf('@') + 2)) == -1){
				alert('Email adres ' + strEmailAddr + ' is geen geldig adres!');
		    return false;
	}
	
	if (strEmailAddr.indexOf(" ") != -1){
		alert('Email adres ' + strEmailAddr + ' is geen geldig adres!');
	    return false;
	}

	return true;
}

function controleerVeld (strVeldId, intMinLengte, intMaxLengte) {
	var element;
	if (document.all) {
		element = document.all[strVeldId];
	} else if (document.getElementById) {
		element = document.getElementById(strVeldId);
	}
	
	if (element.value.length < intMinLengte || element.value.length > intMaxLengte) {
		toonElement(strVeldId + "_fout");
		element.style.borderStyle = 'solid';
		element.style.borderWidth = '2';
		element.style.borderColor = '#FF0000';
		return false;
	} else {
		verbergElement(strVeldId + "_fout");
		element.style.borderStyle = 'dotted';
		element.style.borderWidth = '1';
		element.style.borderColor = '#333333';		
		return true;
		
	}
}
//-->