enl_buttonurl[0] = 'prev';
enl_buttontxt[0] = 'Previous picture [left arrow key]';
enl_buttonoff[0] = -180;
enl_buttonurl[1] = 'next';
enl_buttontxt[1] = 'Next picture [right arrow key]';
enl_buttonoff[1] = -198;
enl_buttonurl[2] = 'close';
enl_buttontxt[2] = 'Close [Esc key]';
enl_buttonoff[2] = -126;