function fp_ie4() {
	var nav = navigator.appVersion.indexOf("MSIE");
	return (nav>0) && (parseInt(navigator.appVersion.substring(nav+5, nav+6)) >= 4);
}

function ShowImg(scr)
{	
	var el = document.images["GalleryMainImg"];
	var img = 'images/scr'+scr+'.gif';
	if (el) {
		if(fp_ie4()) {
			el.style.visiblity = "hidden";
			el.src = img;
			el.style.visiblity = "visible";
		} else {
			el.src = img;
		}
	}
}