function show(main){
        if (document.all) {
                document.all(main).style.visibility="visible";
        }
        if (document.layers) {
                document.layers[main].visibility = "show";
        }
        if(navigator.userAgent.indexOf("Gecko")!=-1){
                document.getElementById(main).style.visibility = "visible";
        }
}

function out(main){
        if (document.all) {
                document.all(main).style.visibility="hidden";
        }
        if (document.layers) {
                document.layers[main].visibility = "hidden";
        }
        if(navigator.userAgent.indexOf("Gecko")!=-1){
                document.getElementById(main).style.visibility = "hidden";
        }
}