function swapChart(newsrc)
	{
		document.getElementById('mainchart').src="http://128.6.226.99/~njwxnet/charts/midsize/"+newsrc;
	}

	function showWarning()
	{	
		document.getElementById('warning').style.display="block";
		document.getElementById('greyout').style.display="block";
		var myFx = new Fx.Style('greyout', 'opacity').custom(0,.7);	
		var myFx = new Fx.Style('warning', 'opacity').custom(0,1);
	}
	
	function closeWarning()
	{
		document.getElementById('greyout').style.display="none";
		document.getElementById('warning').style.display="none";
	}


	/*
	Text Link/Image Map Tooltip Script- 
	© Dynamic Drive (www.dynamicdrive.com)
	For full source code, and 100's more DHTML scripts
	Visit http://www.dynamicdrive.com
	*/

	if (!document.layers&&!document.all&&!document.getElementById)
		event="test"
		function showtip(current,e,text){

			if (document.all||document.getElementById){
				thetitle=text.split('<br>')
				if (thetitle.length>1){
					thetitles=''
					for (i=0;i<thetitle.length;i++)
						thetitles+=thetitle[i]
						current.title=thetitles
				}
				else
					current.title=text
			}

			else if (document.layers){
				document.tooltip.document.write('<layer bgColor="white" style="border:1px solid black;font-size:12px;">'+text+'</layer>')
				document.tooltip.document.close()
				document.tooltip.left=e.pageX+5
				document.tooltip.top=e.pageY+5
				document.tooltip.visibility="show"
			}
		}
		function hidetip(){
			if (document.layers)
				document.tooltip.visibility="hidden"
		}

	/* 
		end Text Link-Image Map Tooltip Script 
	*/