function openUL(ulId) {
    if ( ulId != "" ) {
	var re = new RegExp("^sub");
    navi=ulId.replace(re,"");
	subnavi="sub"+navi;
    document.getElementById(subnavi).style.visibility = "visible";	
    }
}
function closeUL(ulId) {
    if ( ulId != "" ) {
	var re = new RegExp("^sub");    
	navi=ulId.replace(re,"");
	subnavi="sub"+navi;
	document.getElementById(subnavi).style.visibility = "hidden";
    }
}