function show(id) 
{
	var elmt = document.getElementById(id);

	elmt.style.display = 'block';
	return true;
}

function showElmts() 
{
	var divNb = arguments.length;

	for (i = 0; i < divNb; i++)
		show(arguments[i]);

	return true;
}

function hide(id) 
{
	var elmt = document.getElementById(id);

	elmt.style.display = 'none';
	return true;
}

function hideElmts() 
{
	var divNb = arguments.length;

	for (i = 0; i < divNb; i++)
		hide(arguments[i]);

	return true;
}

/*
Credits : Peter Paul Koch - http://www.quirksmode.org/dom/getstyles.html
*/
function getStyle(el,styleProp)
{
	var x = document.getElementById(el);
	if (x.currentStyle)
		var y = x.currentStyle[styleProp];
	else if (window.getComputedStyle)
		var y = document.defaultView.getComputedStyle(x,null).getPropertyValue(styleProp);
	return y;
}

function switchDisplay(id) 
{
	var displayBefore = getStyle(id, 'display');
	var elmt = document.getElementById(id);
			
	switch (displayBefore)
	{
		case 'none' :
			elmt.style.display = 'block';
			break;
		case 'block' :
			elmt.style.display = 'none';
			break;
	}
	return true;
}