function switchTag(tag,idx,counts,elem,defaultClass,focusClass){
	for(i=0;i<counts;i++){
		if(i == idx){
			document.getElementById(tag+i).className=focusClass;
			document.getElementById(elem+i).style.display="block";
		}else{
			document.getElementById(tag+i).className=defaultClass;
			document.getElementById(elem+i).style.display="none";
		}
	}
}