home_on = new Image();
home_on.src = "style/img/home_on.jpg";
server_on = new Image();
server_on.src = "style/img/server_on.jpg";
virtual_on = new Image();
virtual_on.src = "style/img/virtual_on.jpg";
connectivity_on = new Image();
connectivity_on.src = "style/img/connectivity_on.jpg";
about_on = new Image();
about_on.src = "style/img/about_on.jpg";

function doSwitch(source,what) {
	document[source].src = "style/img/"+ source +"_"+ what +".jpg";
}