function objetoAjax(){
	var xmlhttp=false;
	try {
		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
		try {
		   xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (E) {
			xmlhttp = false;
  		}
	}

	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
		xmlhttp = new XMLHttpRequest();
	}
	return xmlhttp;
}
function checavalidador(){
  	     divResultado = document.getElementById('validahuman');
	     randoms=document.getElementById('random').value;
		      ajax=objetoAjax();
	          ajax.open("POST", "validahuman.php",true);
	          ajax.onreadystatechange=function() {
		          if (ajax.readyState==4) {
		 	       var respuesta = ajax.responseText.length;  
				   divResultado.innerHTML =ajax.responseText; 
				  }
        	 }
         	ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	        ajax.send("randoms="+randoms);   	
     }