/* This code is inspired by "www.themaninblue.com" */

if(document.getElementsByTagName)
{
    var imagePopupLinks = document.getElementsByTagName("a");

    for (i=0; i<imagePopupLinks.length; i++)
    {
        if(imagePopupLinks[i].className == "screenshot")
        {
            imagePopupLinks[i].onclick = popupImage; 
        }
    }
}