function ImageObject(imgName) {

	if (document.images) {
		return document.images[imgName];
	}
	
	if (window.document[imgName]) {
		return window.document[imgName];
	}
	else { // if (navigator.appName.indexOf("Microsoft Internet")!=-1) 
		return document.getElementById(imgName);
	}

}

function SwapImage(imgName,imgSrc) {

	var imageObject = ImageObject(imgName) ;
	
	if (imageObject !=null){
		imageObject.src = imgSrc;
	}

}