function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		local_key_word_over = newImage("../img/chara/local_key_word_over.gif");
		local_course_over = newImage("../img/chara/local_course_over.gif");
		local_teacher_over = newImage("../img/chara/local_teacher_over.gif");
		local_message_over = newImage("../img/chara/local_message_over.gif");
		local_graduate_over = newImage("../img/chara/local_graduate_over.gif");
		local_outline_over = newImage("../img/chara/local_outline_over.gif");
		local_research_over = newImage("../img/chara/local_research_over.gif");

		var the_images = new Array('../img/pull_bg.gif', '../img/pull_bg_sub.gif');

		preloadFlag = true;
	}
}