// show hide an element 
// ex.: <a href="javascript:toggleIt('ID-to-toggle')">click...</a>

function toggleIt( targetID ) {
    if (document.getElementById) {
        var el = document.getElementById( targetID );
        if (el.style.display == "block") {
            el.style.display = "none";
        }
        else {
           el.style.display = "block";
        }
    }
}