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// place your images in this array
var random_images_array = ['plante01.svg', 'fougere01.svg', 'corniche-profil.svg'];

function getRandomImage(imgAr, path) {
    path = '../images/random-collection/';
    var num = Math.floor( Math.random() * imgAr.length );
    var img = imgAr[ num ];
    var imgStr = '<img src="' + path + img + '" alt = "">';
    document.write(imgStr); document.close();
}