script.js

let small = document.getElementById("seasonSmallImage");
let medium = document.getElementById("seasonMediumImage");
let springSmall = "https://d1tgh8fmlzexmh.cloudfront.net/ccbp-dynamic-webapps/seasons-switcher-spring-xs-img.png";
let springMedium = "https://d1tgh8fmlzexmh.cloudfront.net/ccbp-dynamic-webapps/seasons-switcher-spring-md-img.png";
let summerSmall = "https://d1tgh8fmlzexmh.cloudfront.net/ccbp-dynamic-webapps/seasons-switcher-summer-xs-img.png";
let summerMedium = "https://d1tgh8fmlzexmh.cloudfront.net/ccbp-dynamic-webapps/seasons-switcher-summer-md-img.png";
let autumnSmall = "https://d1tgh8fmlzexmh.cloudfront.net/ccbp-dynamic-webapps/seasons-switcher-autumn-xs-img.png";
let autumnMedium = "https://d1tgh8fmlzexmh.cloudfront.net/ccbp-dynamic-webapps/seasons-switcher-autumn-md-img.png";
let winterSmall = "https://d1tgh8fmlzexmh.cloudfront.net/ccbp-dynamic-webapps/seasons-switcher-winter-xs-img.png";
let winterMedium = "https://d1tgh8fmlzexmh.cloudfront.net/ccbp-dynamic-webapps/seasons-switcher-winter-md-img.png";

function spring() {
    small.src = springSmall;
    medium.src = springMedium;
}

function summer() {
    small.src = summerSmall;
    medium.src = summerMedium;
}

function autumn() {
    small.src = autumnSmall;
    medium.src = autumnMedium;
}

function winter() {
    small.src = winterSmall;
    medium.src = winterMedium;
}