function addFile() {
	if(document.getElementById('nr_of_files').value<40) {
		var nr =  parseInt(document.getElementById('nr_of_files').value)+1;
		var files_container = document.getElementById('files_container');
		var new_file = document.createElement('div');
	
		new_file.setAttribute('id', 'file_item_'+nr);
		new_file.setAttribute('className', 'file_item');
		new_file.setAttribute('class', 'file_item');

		new_file.innerHTML = 
			'	<label for="file'+nr+'" class="ulFile">bestand '+nr+':</label><input type="file" name="file'+nr+'" id="file'+nr+'" class="uiFile" rel="!empty" /><br />' +
			'	<label for="file'+nr+'_description" class="ulDescription">beschrijving:</label><input type="text" id="file'+nr+'_description" name="file'+nr+'_description" class="uiDescription" />';
		files_container.appendChild(new_file);
	
		document.getElementById('nr_of_files').value = nr;
		return false;
	}
}

function removeFile() {
	if(document.getElementById('nr_of_files').value>1) {
		var files_container = document.getElementById('files_container');
		
		files_container.removeChild(files_container.lastChild);
		if(document.getElementById('nr_of_files').value>0) document.getElementById('nr_of_files').value = parseInt(document.getElementById('nr_of_files').value-1)
	}
	return false;
}


/* thanks, ppk */
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}