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Random Number with javascript or jquery
$(document).ready(function () {
    abc();
    test = array();

    function abc() {
        res = randomXToY(1, 10, 0);

        $('#img' + res).fadeTo(1200, 1);
        //$(this).addClass('activeImg');
        //});
        setTimeout(function () {
            removeClassImg(res)
        }, 3000);
    }

    function removeClassImg(res) {
        $('#img' + res).fadeTo(1200, 0.1);
        //$('#img' + res).removeClass('activeImg');
        abc();
    }

    function randomXToY(minVal, maxVal, floatVal) {
        var randVal = minVal + (Math.random() * (maxVal - minVal));

        return typeof floatVal == 'undefined' ? Math.round(randVal) : randVal.toFixed(floatVal);

    }
});

function Randomizer(minVal, maxVal, floatVal){
    var possible_results = []; // for larger arrays you can build this using a loop of course
    var randomization_array = [];
    var count = minVal;
    var incrementor = floatVal || 1; // set the distance between possible values (if floatVal equals 0 we round to 1)
    while (count <= maxVal) {
        possible_results.push(count);
        count += incrementor;
    }

    this.run = function(){
        // if randomization_array is empty set posssible results into it
        randomization_array = randomization_array.length ? randomization_array : $.merge(randomization_array, possible_results);
        // pick a random element within the array
        var rand = Math.floor(Math.random()*randomization_array.length);
        // return the relevant element
        return randomization_array.splice(rand,1)[0];
    }
}

rand = new Randomizer(1,10,0);
rand.run();