function sobre(name){
	eval("trans=document.images['"+name+"_1'].src");
	eval("document.images['"+name+"_1'].src=document.images['"+name+"_2'].src");
	eval("document.images['"+name+"_2'].src=trans");
}

/* -------------------------------------- */
function goto_url_window(url)
{
 window.open(url);
 return true;
}

/* -------------------------------------- */
function goto_url(url)
{
 document.location.href=url;
 return true;
}