On Click, set cookie and check checkbox

I have a screen with checkboxes, on click of the label a new window will be opened with text and an agree button. Once the user clicks the agree button, a cookie is set with a unique id referencing the checkbox. How do I check this checkbox based on if the cookie equals 1. Code is below

Initial checkbox:

<input type="checkbox" id="agreementChecker-0" name="agreeCheck-0" value="35" class="mandatory agreeChecker doc_35_readit">

New Window opens with text, button at bottom:

<p align="center" id="have_read_agreement" style="text-align:center;font-size:20px;"><a href="javascript:window.close()" class="btn-read">I have read this agreement and accept all terms and conditions.</a></p>

Javascript that sets the cookie:

document.cookie = "doc_35_readit=0";

$('#have_read_agreement').on('click', function(){

document.cookie = "doc_35_readit=1";

});

Now when the window is closed, not sure how to check the checkbox. Something like this maybe?

if (cookie("doc_35_readit") == "1") {
    $(".doc_35_readit").click();
}

Any help would be appreciated