function preloadCommonImages() {
	var img = new Array();
	for (var i=0; i < 13 ; i++) {
		img[i] = new Image();
	} 
	img[0].src = "/medical/common/linkarrow_over.gif";
	img[1].src = "/medical/common/side_request_over.gif";
	img[2].src = "/medical/common/side_opencampus_over.gif";
	img[3].src = "/medical/common/side_subject_pt1_over.gif";
	img[4].src = "/medical/common/side_subject_dh_over.gif";
	img[5].src = "/medical/common/side_subject_ot_over.gif";
	img[6].src = "/medical/common/side_subject_emt_over.gif";
	img[7].src = "/medical/common/side_subject_ce_over.gif";
	img[8].src = "/medical/common/side_karuizawa_over.gif";
	img[9].src = "/medical/common/side_faq_over.gif";
	img[10].src = "/medical/common/side_graduated_over.gif";
	img[11].src = "/medical/common/side_hospital_over.gif";
	img[12].src = "/medical/common/side_access_over.gif";
}