function login(){

var txt_login_user = document.getElementById('txt_login_user').value;
var txt_login_password = document.getElementById('txt_login_password').value;
var chk_recordar = document.getElementById('chk_recordar');









if(txt_login_user !='' && txt_login_password!=''){

	if(ajax.readyState != 4){
		ajax = getXHR();
	}

url='seccio.php?on=perfil&f=login&user='+txt_login_user+'&pass='+txt_login_password;

if(chk_recordar.checked)url+='&recordar=1';


aleatori = '&hash=' + Math.random();



	ajax.open('GET', url+aleatori, true);

	ajax.onreadystatechange=function()
	{
		if (ajax.readyState==4)
		{
if(ajax.status==200)
	                {

	switch(ajax.responseText){
		case "0":
			alert("El nom usuari o la clau no son valids");
			break;
		case "-1":
			alert("El compte d'usuari no ha sigut validat, fins que no estigui validat no et pots connectar");
			break;
		default:
			//document.location.href='seccio.php?on=perfil&id='+ajax.responseText;
			document.location.href=ajax.responseText;
			break;
	}
	
}
		}
	}
	ajax.send('');








}else{

alert("has d'introduir el nom d'usuari i la clau");
}


}