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) {
		m1_over = newImage("../images/m1_on.gif");
		m2_over = newImage("../images/m2_on.gif");
		m3_over = newImage("../images/m3_on.gif");
		m4_over = newImage("../images/m4_on.gif");
		m5_over = newImage("../images/m5_on.gif");
		pn_over = newImage("../images/pn_g_over.gif");
		po_over = newImage("../images/po_g_over.gif");
		pso_over = newImage("../images/pso_g_over.gif");
		pz_over = newImage("../images/pz_g_over.gif");
		pw_over = newImage("../images/pw_g_over.gif");
		psw_over = newImage("../images/psw_g_over.gif");
		psb_over = newImage("../images/psb_g_over.gif");
		preloadFlag = true;
	}
}