Show/Hide checkbox based on onLoad properties

I have a check box:

   <tr><td class="form-row" colspan="2" style="font-weight:bold; font-size:10px; color: #006699;"> <a href="javascript:void(0);"></a>
        <label> Display Value</label>
            <input type="checkbox" name="Display"  id="Display" />
    </td></tr>

Based on the onload function, i need to show/hide the checkbox completely.

        window.onload = function (e) {
        var dateOfToday = getCurrentDay();
        var presentDate = document.getElementById("presentDate");
       if (presentDate) {
            presentDate.value = dateOfToday;
        }
        var datetiMe = "<%= session.getAttribute("PresetValEndDate")%>";
        var setPVInput = formatDate(datetiMe);

        if (setPVInput > dateOfToday || setPVInput == dateOfToday){
            document.getElementById("myFieldset").disabled = false;
            //hidecheckbox

        }
        else(setPVInput < dateOfToday)
        {
            document.getElementById("myFieldset").disabled = true;
            //show checkbox

        }
    }

I tried the following but it didn't work.

 document.getElementById("Display").disabled = false;

Any help is appreciated. Thank you.