function verzenden(f) {
	document.getElementById('parse').value = "c";	
	document.getElementById(f).submit();
}

function getStyle( layer ) {
	if( document.getElementById ) {
		return document.getElementById( layer ).style
	} else if( document.all ) {
		return document.all[layer].style
	} else {
		return document[layer]
	}
}

function swapvisible(laag,modus) {
	getStyle(laag).visibility = modus;
	if(modus == 'visible') {
		getStyle(laag).display = 'block';
	} else {
		getStyle(laag).display = 'none';
	}
}