function posaLogo(){
        // Petición básica
        Ext.Ajax.request({
            url: 'logos/logos.php',
            method: 'POST',
            success: logosOk,
            failure: logosKo,
            timeout: 10000,
            params: {
                operation: 'load'
            }
        });
    };

    function logosKo(){
    	var objDiv = Ext.get('logos');  
    	objDiv.update("*");  
    	}
    
    function logosOk(response,action){
    		if (response.responseText==""){
    		}
    		else{
	    	   var resposta = eval('(' + response.responseText + ')');
	    	   var logo = resposta.rows[0].grafic;
	    	   var descripcio = resposta.rows[0].textcas;
	    	   var autor = resposta.rows[0].autor;
	    	   var bgImg = "url(../logos/" + logo +")";
	    	   var bgFilter ="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='logos/fixes/'" + logo +"', sizingMethod='scale');";

	    	   document.getElementById('logos').style.backgroundImage=bgImg;
	    	   document.getElementById('logos').style.filter=bgFilter;
			   new Ext.ToolTip({
			        target: 'logos',
			        title: descripcio,
			        width:200,
			        html: descripcio + ' by ' + autor,
			        trackMouse:true
			   });    	   
    		}
    	}