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) {
		about_on = newImage("./images/btn_about_on.jpg");
		products_on = newImage("./images/btn_products_on.jpg");
		projects_on = newImage("./images/btn_projects_on.jpg");
		markets_on = newImage("./images/btn_markets_on.jpg");
		distribution_on = newImage("./images/btn_distribution_on.jpg");
		preloadFlag = true;
	}
}

function img_over(id) {
	document.getElementById("ig" + id).className = 'selected';
	return;
}

function img_out(id) {
	document.getElementById("ig" + id).className = 'gallery';
	return;
}