var myfotopanel;

function init() {
  myfotopanel = new YAHOO.widget.Panel('fotopanel', 
  {visible:false, constraintoviewport:true, draggable:false, underlay:'none'} );
  myfotopanel.render();
}
YAHOO.util.Event.onDOMReady(init);

function show_fotopanel(img) {
  myfotopanel.setBody('<img src='+ img 
  + ' onClick="myfotopanel.hide();" onLoad="center_fotopanel();"'
  + ' id="bigimage"' + '>');
}

function center_fotopanel() {
    widthie6 = document.getElementById('bigimage').width + 10;
    myfotopanel.cfg.setProperty('width', widthie6 + 'px');
    myfotopanel.center();
    myfotopanel.show();
    }