function get_random(number)
        {
            var ranNum= Math.round(Math.random()*number);
            return ranNum;
        }
    
    function showReference(){
    ranNumber = get_random(antal_references-1)
        if(document.getElementById("referenceTable_"+(ranNumber+1))){
        document.getElementById("referenceTable_"+(ranNumber+1)).style.display="block"
        }
    }