function hideElement(element)
{
	document.getElementById(element).style.visibility="hidden";
	document.getElementById(element).style.display="none";
}
function showElement(element)
{
	document.getElementById(element).style.visibility="visible";
	document.getElementById(element).style.display="block";
}
function isVisible(element)
{
	if(document.getElementById(element).style.visibility=="visible")
	{return true;}
	else {return false;}
}
function showOnlyOne(){
	c=arguments.length;
	if(!isVisible(arguments[0]))
	{
		showElement(arguments[0]);
		for(var i=1;i<c;i++)
		{
			hideElement(arguments[i]);
		}
	}
}