var flag = null;
function showInfo(str){
	for( i =1;i<11;i++){
	document.getElementById('tr'+i).className = "none";
	}
	if(flag!=str){
	document.getElementById(str).className = "block";
	flag = str;
	}else{
	document.getElementById(str).className = "none";
	flag = null;
	}			
}