Javascript checkbox notes

checkbox.js

// http://stackoverflow.com/questions/10436764/how-to-set-default-checkbox-status-with-javascript

// javascript to check if checkbox is checked / unchecked
// To change checkbox state try this:
document.getElementById("RememberMe").checked = true;

// If you need to change the value of checkbox as an input element use:
document.getElementById("RememberMe").value = "New Value";

// However, you can set default value and state in HTML markup:
<input id="RememberMe" name="RememberMe" type="checkbox" value="The Value" checked="checked" />

// jquery code
$('#RememberMe').attr('checked', true); 

/////////////
// http://bl.ocks.org/nsonnad/4175202

<div>
    <input type="checkbox" id="bric" onclick="briclight()">BRICs</input>
    <input type="checkbox" id="mist" onclick="mistlight()">MIST</input>
</div>

// ugly javascript for highlighting the two groups of countries
function briclight() {
    var chkbox = document.getElementById("bric");
    if (chkbox.checked) {
        document.getElementById("China").style.cssText = "opacity:1;",
        document.getElementById("Brazil").style.cssText = "opacity:1;",
        document.getElementById("India").style.cssText = "opacity:1;",
        document.getElementById("Russia").style.cssText = "opacity:1;"
    } else { 
        document.getElementById("China").style.cssText = "",
        document.getElementById("Brazil").style.cssText = "",
        document.getElementById("India").style.cssText = "",
        document.getElementById("Russia").style.cssText = "";
    }};
    
function mistlight() {
    var chkbox = document.getElementById("mist")
    if (chkbox.checked) {
        document.getElementById("Mexico").style.cssText = "opacity:1;",
        document.getElementById("Indonesia").style.cssText = "opacity:1;",
        document.getElementById("S Korea").style.cssText = "opacity:1;",
        document.getElementById("Turkey").style.cssText = "opacity:1;"
    } else { 
        document.getElementById("Mexico").style.cssText = "",
        document.getElementById("Indonesia").style.cssText = "",
        document.getElementById("S Korea").style.cssText = "",
        document.getElementById("Turkey").style.cssText = "";
    }};