Hey guys, i am using this code below for my div, but i need layer 1 to show up on page load. Does anyone know how to make it work?

function showlayer1() {
document.getElementById("layer1").style.display="block";
document.getElementById("layer2").style.display="none";
document.getElementById("layer3").style.display="none";
}

function showlayer2() {
document.getElementById("layer1").style.display="none";
document.getElementById("layer2").style.display="block";
document.getElementById("layer3").style.display="none";
}


function showlayer3() {
document.getElementById("layer1").style.display="none";
document.getElementById("layer2").style.display="none";
document.getElementById("layer3").style.display="block";
}

Thanks,