set random number on textbox through java script.


function random()
            {
                var generator = Math.floor(Math.random()*10000);
                var ss="BN"+"-"+generator;
                document.getElementById("bill").value=ss;
                var generator1 = Math.floor(Math.random()*10000);
                var ss1="ON"+"-"+generator1;
                document.getElementById("on").value=ss1;
                return false;
            }

<body class="aaa" onload="InitialLoad(); random();">

<tr>
                            <td>Bill Number</td>
                            <td><input type="text" name="bill" class="text4" id="bill"></td>
                            <td>Bill Date</td>
                            <td><input type="text" name="billdate" class="text4" id="billdate"></td>
                            <td>Order Number</td>
                            <td><input type="text" name="on" class="text4" id="on"></td>
                        </tr>

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