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 preloadImage() {
	if (document.images) {
		tk_heading_03_over = newImage("images/tk_heading_03-over.gif");
		tk_heading_06_over = newImage("images/tk_heading_06-over.gif");
		tk_heading_09_over = newImage("images/tk_heading_09-over.gif");
		tk_heading_12_over = newImage("images/tk_heading_12-over.gif");
		tk_heading_16_over = newImage("images/tk_heading_16-over.gif");
		tk_heading_19_over = newImage("images/tk_heading_19-over.gif");
		tk_heading_21_over = newImage("images/tk_heading_21-over.gif");
		preloadFlag = true;
	}
}