function openThread(catId, imgId)
{
	catToOpen = document.getElementById(catId);
	imgToChange = document.getElementById(imgId);
	if (!catToOpen.isVis)
		{
		catToOpen.isVis = true;
		catToOpen.className = "threadContainer";
		imgToChange.style.backgroundImage = "url(media/images/resourceMinus.jpg)"
		}
	else
		{
		catToOpen.isVis = false;
		catToOpen.className = "threadContainerHide";
		imgToChange.style.backgroundImage = "url(media/images/resourcePlus.jpg)"
		}
}