function initialise() {
var element = document.getElementById('element-id');

if (element && element.style)
element.style.display = 'none';
}

function toggleDisplay(element) {
var style;

if (typeof element == 'string')
element = document.getElementById(element);
if (element && (style = element.style))
style.display = (style.display == 'none') ? '' : 'none';
}

if (!document.getElementById)
document.getElementById = function() {return null;};