function swap(name , image){
	switch(name)
	{
		case 1:
			document.home.src=image;
			break;
		case 2:
			document.news.src=image;
			break;
		case 3:
			document.school_intro.src=image;
			break;
		case 4:
			document.subject.src=image;
			break;
		case 5:
			document.campus_info.src=image;
			break;
		case 6:
			document.activities_info.src=image;
			break;
		case 7:
			document.pta.src=image;
	}
}

function right(e) {
	var msg = "版權所限，未經許可，不得複製。";

	if (navigator.appName == 'Netscape' && e.which == 3) {
		alert(msg);
		return false;
	}
	else
		if (navigator.appName == 'Microsoft Internet Explorer' &&	event.button==2) {
		alert(msg);
		return false;
	}
	return true;
}
document.onmousedown = right;