function setElementVisibility(id, visible)
{
	var element = document.getElementById(id);
	if(element == null)
		trace('setElementVisibility(): Element not found: ' + id);
	else
		element.style.visibility = visible ? 'visible':'hidden';
}

function setElementDisplay(id, display)
{
	var element = document.getElementById(id);
	if(element == null)
		trace('setElementDisplay(): Element not found: ' + id);
	else
		element.style.display = display;
}

function setElementInnerHTML(id, html)
{
	var element = document.getElementById(id);
	if(element == null)
		trace('setElementInnerHTML(): Element not found: ' + id);
	else
		element.innerHTML = html;
}

function setElementStyle(id, styleName, value)
{
	var element = document.getElementById(id);
	if(element == null)
		trace('setElementStyle(): Element not found: ' + id);
	else
		element.style.background = value;
}

function trace(message)
{
	/*if(eval('console.log') != null)
		console.log(message);*/
	//alert(message);
}