function get_categories() {
	var url='index.php?option=com_mconsult&controller=posts&task=get_categories_xml';
	var param='section_id='+document.adminForm.section_id.options[document.adminForm.section_id.selectedIndex].value;
	
	processAjax(param,url,set_categories);
}

function set_categories(ajax) {
	var f=document.adminForm;
	var xml=ajax.responseXML;
	var categories=xml.getElementsByTagName('category');
	var category_id=document.getElementById('category_id');
	category_id.options.length=1;
	
	for(var i=0;i<categories.length;i++) {
		var option=document.createElement('option');
		option.setAttribute('value',categories[i].getElementsByTagName('id')[0].firstChild.nodeValue);
		option.appendChild(document.createTextNode(categories[i].getElementsByTagName('title')[0].firstChild.nodeValue));
		category_id.appendChild(option);
	}
}

function check_nick(nick) {
	var url='index.php?option=com_mconsult&controller=posts&task=check_nick';
	var param='nick='+nick;
	processAjax(param,url,function(ajax) {
		var xml=ajax.responseXML;
		if(xml.getElementsByTagName('state')[0].firstChild.nodeValue==1) {
			alert('Toto jméno nemůžete použít - odpovídá jménu registrovaného uživatele');
			document.adminForm.nick.value="";
			document.adminForm.nick.focus();
			return false;
		}
	});
}