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) {
		b1 = newImage("../images/but1_2.gif");
		b11 = newImage("../images/but11_2.gif");
		b12 = newImage("../images/but12_2.gif");
		b13 = newImage("../images/but13_2.gif");
		b14 = newImage("../images/but14_2.gif");
		b2 = newImage("../images/but2_2.gif");
		b21 = newImage("../images/but21_2.gif");
		b3 = newImage("../images/but3_2.gif");
		b31 = newImage("../images/but31_2.gif");
		b4 = newImage("../images/but4_2.gif");
		b5 = newImage("../images/but5_2.gif");
		b6 = newImage("../images/but6_2.gif");
		b7 = newImage("../images/but7_2.gif");
		b71 = newImage("../images/but71_2.gif");
		b8 = newImage("../images/but8_2.gif");
		
		preloadFlag = true;
	}
}