var preloadFlag = true;
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];
		}
	}
}


function changeBgImage(element, img) {
  newImage = "url(" + img + ")";
  document.getElementById(element).style.backgroundImage = newImage;
}

function changeImage(element, img) {
  document.getElementById(element).src = img;
}

function changeCssStyle(element, newClassName) {
  document.getElementById(element).className = newClassName;
}