function calificar(id) {
var XMLHttp = new newXMLHttpRequest();
votacion = document.getElementById("votacion").value;
Set_Cookie( 'voto', id, 1, '/', '', '' );
rand = Math.random(); 
url = "ajax_calificar.php?id=" + id + "&votacion=" + votacion + "&rand=" + rand;
XMLHttp.open("GET",url,true);
XMLHttp.onreadystatechange = procesarRespuesta;
XMLHttp.send(null);
function procesarRespuesta() {
	if(XMLHttp.readyState == 4 && XMLHttp.status == 200) {
		var respuesta = XMLHttp.responseText;
		var califica = document.getElementById('califica');
		califica.innerHTML = respuesta;
		Delete_Cookie('voto', '/', '')} else {
 var califica = document.getElementById('califica');
        califica.innerHTML = "Agregando voto...";}} } 
function Set_Cookie( name, value, expires, path, domain, secure )
{var today = new Date();
today.setTime( today.getTime() );
if ( expires )
{
expires = expires * 1000 * 60 * 60 * 24;
}
var expires_date = new Date( today.getTime() + (expires) );
document.cookie = name + "=" +escape( value ) +
( ( expires ) ? ";expires=" + expires_date.toGMTString() : "" ) +
( ( path ) ? ";path=" + path : "" ) +
( ( domain ) ? ";domain=" + domain : "" ) +
( ( secure ) ? ";secure" : "" );
}
function Delete_Cookie( name, path, domain ) {
if ( Get_Cookie( name ) ) document.cookie = name + "=" +
( ( path ) ? ";path=" + path : "") +
( ( domain ) ? ";domain=" + domain : "" ) +
";expires=Thu, 01-Jan-1970 00:00:01 GMT";
}
function Get_Cookie( check_name ) {
	var a_all_cookies = document.cookie.split( ';' );
	var a_temp_cookie = '';
	var cookie_name = '';
	var cookie_value = '';
	var b_cookie_found = false; 
	for ( i = 0; i < a_all_cookies.length; i++ )
	{
		a_temp_cookie = a_all_cookies[i].split( '=' );
		cookie_name = a_temp_cookie[0].replace(/^\s+|\s+$/g, '');
		if ( cookie_name == check_name )
		{
			b_cookie_found = true;
			if ( a_temp_cookie.length > 1 )
			{
				cookie_value = unescape( a_temp_cookie[1].replace(/^\s+|\s+$/g, '') );
			}
			return cookie_value;
			break;
		}
		a_temp_cookie = null;
		cookie_name = '';
	}
	if ( !b_cookie_found )
	{
		return null;
	}
}