function hidedivs(parentname, divname)
{
	var div = document.getElementById(parentname);	
	for(var i = 0; i < div.childNodes.length; i++)
	{
		if (div.childNodes[i].tagName == "DIV")
		{			
			if (div.childNodes[i].style.display == "block")
			{	
				div.childNodes[i].style.display = "none";
			}
		}
	}
	document.getElementById(divname).style.display = "block";
}