function execute(destino,url,parameters) 
	{
      var randomnumber=Math.floor(Math.random()*101)
	  document.getElementById(destino).innerHTML="<img src='http://www.customizeinternet.com/images/loading.gif'>";
 			$.ajax(
			{
		  		type: "POST",
  				url: url,
  				data: parameters+'&rnd='+randomnumber,
		  		success: 
				function(data)
				{
          document.getElementById(destino).innerHTML=data;
        }
			});
	}
	function execute_no_download(destino,url,parameters) 
	{
      var randomnumber=Math.floor(Math.random()*101)
	  	$.ajax(
			{
		  		type: "POST",
  				url: url,
  				data: parameters+'&rnd='+randomnumber,
		  		success: 
				function(data)
				{
          document.getElementById(destino).innerHTML=data;
        }
			});
	}
	function execute_with_countdown(destino,url,parameters) 
	{
      var randomnumber=Math.floor(Math.random()*101)
	  document.getElementById(destino).innerHTML="<img src='http://www.customizeinternet.com/images/loading.gif'>";
 			$.ajax(
			{
		  		type: "POST",
  				url: url,
  				data: parameters+'&rnd='+randomnumber,
		  		success: 
				function(data)
				{
          document.getElementById(destino).innerHTML=data;
          countdown();
        }
			});
	}
	
	function countdown() {
    setTimeout('temporizador()', 1000); // El tiempo antes de abrir 3 segundos
  }
  function temporizador(){
    if (document.getElementById('countdown').value>1) {
      document.getElementById('countdown').value=document.getElementById('countdown').value-1;
      countdown();
    }
    else
    {
      document.getElementById('contador').style.display='none';
      document.getElementById('botones').style.display='block';
    }
  }