var oudelink;
var fading;
document.observe("dom:loaded", function() {
	$$('.imgsmall').invoke( 'observe', 'mouseover', function(s) {
		if (typeof(oudelink)!='string') {
			oudelink = $('imgbig').src;
		}
		if ( typeof(fading) == 'number' ) {
			clearTimeout(fading);
		}
		$('imgbig').src = s.element().src;
	} );
	$$('.imgsmall').invoke( 'observe', 'mouseout', function(s) {
		if ( typeof(fading) == 'number' ) {
			clearTimeout(fading);
		}
		fading = setTimeout(function(){
			$('imgbig').src = oudelink;
		}, 500 );
	} );
});