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 userFile(id) {

	r = document.getElementById('file_'+id);
	
	var user = document.getElementById('usuario_'+id).value;
	var pass = document.getElementById('password_'+id).value;
	var file = document.getElementById('docfile_'+id).value;
	
	r.innerHTML = 'Comprobando nombre de usuario y contraseña...';

	ajax=objetoAjax();
	ajax.open("POST", "wp-content/themes/quimibios/download.php",true);
	ajax.onreadystatechange=function() { if (ajax.readyState==4) { 
		
		r.innerHTML = ajax.responseText;

	} }

	ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	ajax.send('user='+user+'&pass='+pass+'&file='+file)

}