Deselect a default check box

I want to create a checkbox which is unchecked always by default and users should not check it. I don't want to make the checkbox disabled as i want to pass the value of the checkbox when i submit the form. Please suggest. The below code is not working:

<input type="checkbox" id="chkbox1" name="chkbox1" value="unChecked" checked="false" readonly="readonly">

With the above code checkbox is always selected, i want the checkbox always be unselected and users should not able to select it.I should not use the disable option too as i want to send the value of checkbox when i submit the form.Thanks.

Just remove the checked attribute all together

<input type="checkbox" id="chkbox1" name="chkbox1" value="unChecked" readonly="readonly" />

Setting the checked attribute with any string value (even false) makes the checkbox checked

i want the checkbox always be unselected and users should not able to select it.I should not use the disable option too as i want to send the value of checkbox when i submit the form

It doesn't really sound like you want a checkbox at all, but just a hidden input that sends a value

<input type="hidden" name="chkbox1" value="unChecked" />