checkForm = function() {	
	var dropdown_continents = document.getElementById("db_continents");
	var dropdown_anys = document.getElementById("db_anys");
	if ( document.getElementById("db_paisos") ) {
		var dropdown_paisos = document.getElementById("db_paisos");
	}
	
	if ( (dropdown_continents.options[dropdown_continents.selectedIndex].value < 0) || (dropdown_anys.options[dropdown_anys.selectedIndex].value < 0) || ( document.getElementById("db_paisos") && dropdown_paisos.options[dropdown_paisos.selectedIndex].value < 0) ) {
		alert ("Cal especificar les condicions de cerca");
	} else {
		
		_values = "idcont=" + dropdown_continents.options[dropdown_continents.selectedIndex].value;
		_values += "&idany=" + dropdown_anys.options[dropdown_anys.selectedIndex].value;
		
		if ( document.getElementById("db_paisos") ) {
			var dropdown_pais = document.getElementById("db_paisos");
			_values += "&idpais=" + dropdown_pais.options[dropdown_pais.selectedIndex].value;
		} else {
			_values += "&idpais=-1"
		}
		//alert(_values);
		loadContent("wp-content/themes/aecs/incPHP/loadDocs.php", "results", _values);		
	}
}

loadContent = function(_url, _divContainer, _values) {
	var ajax = newAjax();
	
	var _mess_img_loading = "<div class='message_image'><img src='../../common/images/loader_small.gif' />";
	var _mess_txt_loading = " Processant dades</div>";	

	ajax.open ('POST',_url, true);
	ajax.onreadystatechange = function() {
		if (ajax.readyState == 1) {
			document.getElementById(_divContainer).innerHTML = _mess_img_loading + _mess_txt_loading;
			document.getElementById(_divContainer).style.display = "block";
		} else if (ajax.readyState == 4) {
			if(ajax.status == 200) {
				document.getElementById(_divContainer).innerHTML = ajax.responseText;				
			} else if(ajax.status == 404) {
				document.getElementById(_divContainer).innerHTML = "La direccion no existe";
		} else {
			document.getElementById(_divContainer).innerHTML = "Error: " . ajax.status;
		}
		}
	}
	ajax.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
	ajax.send(_values);
	return;
}