// funzioni di swap image

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) {
		test_01_over = newImage("images/test_01-over.gif");
		test_01_test_02_over = newImage("images/test_01-test_02_over.gif");
		test_02_over = newImage("images/test_02-over.gif");
		preloadFlag = true;
	}
}

// esempi di utilizzo

//<BODY ONLOAD="preloadImages();">

//<TD>                      
//		<A HREF="#"
//		ONMOUSEOVER="changeImages('test_01', 'images/test_01-over.gif', 'test_02', 'images/test_01-test_02_over.gif'); return true;"
//		ONMOUSEOUT="changeImages('test_01', 'images/test_01.gif', 'test_02', 'images/test_02.gif'); return true;">
//		<IMG NAME="test_01" SRC="images/test_01.gif" WIDTH=50 HEIGHT=50 BORDER=0></A></TD>
//<TD>