if (window.addEventListener) {
                                        	window.addEventListener("load", load, false);
                                        	window.addEventListener("resize", load, false);
                                        } else if (window.attachEvent) {
                                        	window.attachEvent("onload", load);
                                        	window.attachEvent("onresize", load);
                                        };


                                        function load () {
                                         


                                          if (navigator.appName=="Microsoft Internet Explorer"){
                                        		x=document.body.clientWidth;
                                        		y=document.body.clientHeight;
                                        	} else {
                                        		x=window.innerWidth;
                                        		y=window.innerHeight;
                                        	}
                                          document.getElementById("colonna_sx").style.left = ((x - 800 - 116)/2) ;
                                          document.getElementById("colonna_centro").style.left = (x - 800 - 116)/2 + 58;
                                          document.getElementById("colonna_dx").style.left = (x - 800 - 116)/2 + 850;



                                          document.getElementById("colonna_centro").appendChild(document.getElementById("menu1"));
                                          document.getElementById("colonna_centro").appendChild(document.getElementById("menu2"));
                                          document.getElementById("colonna_centro").appendChild(document.getElementById("menu3"));
                                          document.getElementById("colonna_centro").appendChild(document.getElementById("menu4"));
                                          document.getElementById("colonna_centro").appendChild(document.getElementById("menu5"));
                                          document.getElementById("colonna_centro").appendChild(document.getElementById("menu6"));
                                          
                                          document.getElementById("contenuti").style.display="block";
                                          document.getElementById("menu1").style.visibility ="visible";
                                          document.getElementById("menu2").style.visibility ="visible";
                                          
                                          document.getElementById("menu4").style.visibility ="visible";
                                          document.getElementById("menu5").style.visibility ="visible";
                                          document.getElementById("menu6").style.visibility ="visible";

                                        }