function hrlychart(){
	graphname=document.img0.src;
	if( graphname.indexOf("yen_hist.gif")!=-1 ){
		document.img0.src="graphs/yen_hist2.gif";
	}
	else if( graphname.indexOf("yen_hist2.gif")!=-1 ){
		document.img0.src="graphs/yen_hist.gif";
	}
}