[COLOR=#000000][COLOR=#007700]<[/COLOR][COLOR=#0000BB]script type[/COLOR][COLOR=#007700]=[/COLOR][COLOR=#DD0000]"text/javascript"[/COLOR][COLOR=#007700]>
function [/COLOR][COLOR=#0000BB]imagen[/COLOR][COLOR=#007700]([/COLOR][COLOR=#0000BB]ver[/COLOR][COLOR=#007700]) {
[/COLOR][COLOR=#0000BB]document[/COLOR][COLOR=#007700].[/COLOR][COLOR=#0000BB]getElementById[/COLOR][COLOR=#007700]([/COLOR][COLOR=#DD0000]'im'[/COLOR][COLOR=#007700]).[/COLOR][COLOR=#0000BB]style[/COLOR][COLOR=#007700].[/COLOR][COLOR=#0000BB]visibility [/COLOR][COLOR=#007700]= [/COLOR][COLOR=#0000BB]ver[/COLOR][COLOR=#007700];
}
[/COLOR][COLOR=#0000BB]</script>
[/COLOR]
<img src="imagen1.jpg" onmouseover="imagen('visible')" onmouseout="imagen('hidden')" />
<img src="imagen2.jpg" id="im" style="visibility:hidden" /> [/COLOR]