var the_images = new Array('../images/but_nounso.gif','../images/but_verbso.gif','../images/but_pronounso.gif','../images/but_adjectiveso.gif','../images/but_adverbso.gif','../images/but_prepositiono.gif','../images/but_conjunctionso.gif','../images/but_interjectionso.gif','../images/but_singpluralo.gif','../images/but_genderso.gif','../images/but_oppositeso.gif','../images/but_puzzleso.gif');
preloadImages(the_images);

function preloadImages(images) {

	for(loop = 0; loop < images.length; loop++)
	{
   		var an_image = new Image();
		an_image.src = images[loop];
	}
}
function detectVersion()
{
	// Version test:
	browserVer = parseInt(navigator.appVersion);
	if ( browserVer > 3) version = 1;
	else version = 2;
	return (version);
}

version=detectVersion();

function swap(imgName,imgFile){
	if (version == 1) {
		document[imgName].src = imgFile;
	}
}