Use Javascript to make Image visible when page opens

I'm looking for Javascript that will fire when page opens and sets Image1 visibility to true.

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If you are referencing the CSS visibility property:

window.onload = function() {

    document.getElementById( 'Image1' ).style.visibility = "visible";`

};

or the display property:

window.onload = function() {

    document.getElementById( 'Image1' ).style.display = "block";

};

If you want it to occur right away utilize the document.onload method. I.e.

document.onload = loadFunc;

function loadFunc() {
document.getElementById( 'Image1' ).style.display = "block";
}

<script>
window.onload = function() {
    document.getElementById("Image1").visibility = "visible";
}
</script>