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function set_background_image(){
let date = new Date();
let current_hour = date.getHours()
if(current_hour <= 8 || current_hour >= 20){
var photo = "night.jpg"
} else if(current_hour <= 10 || current_hour > 17){
var photo = "change.jpg"
} else {
var photo = "day.jpg"
}
let btn = document.getElementById("loadBtn")
if(btn){
btn.remove()
}
if(!document.getElementById("backgroundId")){
document.body.style.backgroundImage = `url('/res/${photo}')`;
let desc = document.createElement("p")
desc.id = "backgroundId"
desc.innerHTML = "Background images in the public domain, painted by <a href=\"https://artvee.com/artist/ivan-konstantinovich-aivazovsky/\">Ivan Konstantinovich Aivazovsky.</a>"
footer.appendChild(desc)
}
}
let el = document.createElement("a")
el.id = "loadBtn"
el.innerText = "load background"
el.onclick = set_background_image
let footer = document.getElementsByTagName("footer")[0]
footer.appendChild(el)
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