function localFilename(url) // removing path
{
 var x = url.lastIndexOf("/");
 url = url.slice(x + 1);
 return url;
}

// images are loaded asynchronously with no delay

function preloading(name)
{
 var xhr=createXHR(); // new instance of object
 xhr.open("GET", name, true);
 xhr.send(null); // we don't need for the result, just loading it in memory
}

function enlarge(element, caminho, legenda)
{
 var name = element.src;
 
 name = localFilename(name);
 name = name.slice(10); // remove the "thumb-" part
 name = caminho + name; // restore path and add the new "big-" prefix


 // building a string to display the image

 var str = "<img src='" + name + "' >";
 document.getElementById("bigview").innerHTML = str;
 document.getElementById("legenda").innerHTML = legenda;

}