function getel(divname) {
return document.getElementById(divname);
}

function show(divname) {
getel(divname).style.display = 'block';
}

function hide(divname) {
getel(divname).style.display = 'none';
}


var dohide1;
var dohide2;
var dohide3;
var dohide4;

var hidetime = 400;

function shownav(id,isover) {
divname = 'subnav'+id;
	if(isover) {
	show(divname);
		if (id == 1)
		clearTimeout(dohide1);
		if (id == 2)
		clearTimeout(dohide2);
		if (id == 3)
		clearTimeout(dohide3);
		if (id == 4)
		clearTimeout(dohide4);
	} else {
		if (id == 1)
		dohide1 = setTimeout("hide('subnav1')",hidetime);
		if (id == 2)
		dohide2 = setTimeout("hide('subnav2')",hidetime);
		if (id == 3)
		dohide3 = setTimeout("hide('subnav3')",hidetime);
		if (id == 4)
		dohide4 = setTimeout("hide('subnav4')",hidetime);
	}
}