function switch_frame(id){
	if(!id) return;
	for(var i=1;i<4;i++){
		if(id==i) show(i);
		else hide(i);
	}
}
function show(id){
	if(document.getElementById('iframe_'+id)) document.getElementById('iframe_'+id).style.display  = "block";
	if(document.getElementById('img_'+id)) document.getElementById('img_'+id).style.display  = "block";
	if(document.getElementById('a_'+id)) document.getElementById('a_'+id).style.color  = "#314e9c";
}
function hide(id){
	if(document.getElementById('iframe_'+id)) document.getElementById('iframe_'+id).style.display  = "none";
	if(document.getElementById('img_'+id)) document.getElementById('img_'+id).style.display  = "none";
	if(document.getElementById('a_'+id)) document.getElementById('a_'+id).style.color  = "white";
}