function ajax_show_contenido(site,content) {
    var container;
	container = document.getElementById('contenido');
		var url = '../ajax_php/ajax_show_contenido.php?&content='+content;
		objAjax.open('GET', url, true);
	    objAjax.onreadystatechange = function() {
	        if (objAjax.readyState == 4) {
	           container.innerHTML = objAjax.responseText;
	        }
	    }
	    objAjax.send(null);	
	 
}