window.onload = clear;

function show(num){
clear();
var tx = document.getElementById(num);
tx.style.visibility = "visible";
tx.style.marginLeft = "-242px";
}

function hide(num){
var tx = document.getElementById(num);
tx.style.visibility = "hidden";
tx.style.marginLeft = "-1242px";
}

function clear(){
document.getElementById("g1").style.visibility = "hidden";
document.getElementById("g1").style.marginLeft = "-1242px";
document.getElementById("g2").style.visibility = "hidden";
document.getElementById("g2").style.marginLeft = "-1242px";
document.getElementById("g3").style.visibility = "hidden";
document.getElementById("g3").style.marginLeft = "-1242px";
document.getElementById("map").style.visibility = "hidden";
document.getElementById("map").style.marginLeft = "-1242px";
}