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show/hide div in nav menu


squigs
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Hello, I am building a navigation bar with sub menus which appear when the main item is clicked and disappear when the user clicks elsewhere. I have read numerous posts concerning this topic but I'm not sure how to implement it. My code is as follows:

 

topNav.js

<script>
var timeout = 50;
var closetimer = 0;
var ddmenuitem = 0;

// open hidden layer
function mopen(id) {

// cancel close timer
 mcancelclosetime();

// get new layer and show it
 ddmenuitem = document.getElementById(id);
 ddmenuitem.style.visibility = 'visible';
}

// close showed layer
function mclose() {
if (ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mclosetime() { 
closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime() {
    if (closetimer) {
        window.clearTimeout(closetimer);
        closetimer = null;
    }
}
// need to somehow close layer when click-out
</script>

Html

<body>

    <div id="main_nav">

    <ul id="nav">

    <li class="nav"><a href="#" onclick="mopen('m1')">

    <span class="nav_parent">CONTACT US</span></a>

    <div id="m1">

 <a href="#">General Inquiries</a>  

 <a href="#">Request a Quote</a>

 <a href="#">Submit Plans</a>

 <a href="#">Submit Photos</a>

  </div></li>

            </ul>

        </div>

</body>

An example of this is at http://jsfiddle.net/schwiegler/t859A/21/

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