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<!DOCTYPE html>
<html>
<head>
    <title>Random Image</title>
    <style>
        img {
            width:150px;
            height:150px;
            border:1px solid black;
        }
    </style>
    <script>
            
        //Red images array
        var redImages = ["./images/red/red001.jpg", "./images/red/red002.jpg", "./images/red/red003.jpg", "./images/red/red004.jpg", "./images/red/red005.jpg", "./images/red/red006.jpg"];
        //Blue images array
        var blueImages = ["./images/blue/blue001.jpg", "./images/blue/blue002.jpg", "./images/blue/blue003.jpg", "./images/blue/blue004.jpg", "./images/blue/blue005.jpg", "./images/blue/blue006.jpg"];        
        
        
        window.onload = function() {
        //When the document has loaded, get random pictures
            RandomBluePicture();
            RandomRedPicture();
        };
        
        function RandomBluePicture() {
    
            var img = blueImages[ randomInt(0, blueImages.length - 1) ];
            var tag = document.getElementsByTagName("img")[0]; //First image tag
            
            alert("Image selected: " + img);
            
            tag.setAttribute("alt", img);
            tag.setAttribute("src", img);
            tag.setAttribute("title", img); 
            
        }
        function RandomRedPicture() {
        
            var img = redImages[ randomInt(0, redImages.length - 1) ];
            var tag = document.getElementsByTagName("img")[1]; //Second image tag
            
            alert("Image selected: " + img);
            
            tag.setAttribute("alt", img);
            tag.setAttribute("src", img);
            tag.setAttribute("title", img);                 
        }
        
        function randomInt(Min, Max) {
            return Math.floor(Math.random() * (Max - Min + 1) + Min);
        }
 
    </script>
</head>
 
<body>
    <button onclick="RandomBluePicture()">Click to get random blue picture</button><br>
    <img>
    <p>&nbsp;</p>
    <button onclick="RandomRedPicture()">Click to get random red picture</button><br>
    <img>
</body>
</html>