var prevLayerID="";
		function expandCollapse(layerID)
		{
			
				if(eval("layer" + layerID + ".style.display")=="none")
				{
					eval("layer" + layerID + ".style.display='block'")
					eval("document.expandCollapse" + layerID + ".src='../images/minus.gif'")
					
				}
				else
				{
					eval("layer" + layerID + ".style.display='none'")
					eval("document.expandCollapse" + layerID + ".src='../images/plus.gif'")
				}
				prevLayerID = layerID
		}