function ajaxFunction() 
{
    var xmlHttp;
    try 
    {
        // Firefox, Opera 8.0+, Safari
        xmlHttp=new XMLHttpRequest();
        return xmlHttp;
    }
	catch(e)
	{
        // Internet Explorer
        try
		{
        xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
        return xmlHttp;
        }
		catch(e)
		{
           try
		   {
			   xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			   return xmlHttp;
		   }
		   catch(e)
		   {
			   alert("Tu navegador no soporta AJAX!");
			   return false;
		   }
		}
	}
}

function Enviar(_pagina,capa)
{
    var ajax;
    ajax = ajaxFunction();

    ajax.open("GET", _pagina, true);
	
	ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	document.getElementById(capa).innerHTML = '<div style="background-image:url(images/ajax-loader.gif); width:24px; height:24px; margin-top:80px; margin-left:auto; margin-right:auto;"></div>';
	ajax.onreadystatechange = function()
	/*document.getElementByID(capa).style = background.url="imageajax-loader.gif";*/
	{
		if(ajax.readyState == 4)
		{
			if(ajax.status==200)
			{
				document.getElementById(capa).innerHTML = ajax.responseText;
			}
		}
	}
    ajax.send(null);
}

function Form_envia(pagina,capa)
{
	var comentario;
	comentario = document.getElementById('txt_mensaje').value;
	
	ajax = ajaxFunction();
	
	ajax.open("POST", pagina, true);
	document.getElementById(capa).innerHTML = '<div style="background-image:url(images/barra_loader.gif); width:220px; height:19px; margin-top:80px; margin-left:auto; margin-right:auto;"></div>';
	ajax.onreadystatechange = function()
	{
		if(ajax.readyState == 4)
		{
			document.getElementById(capa).innerHTML = ajax.responseText;
		}
	}
	ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	ajax.send("com="+comentario);
	
}