function enableSelect() {
  drag.enableDrag(zoomStart, zoomGo, selectEnd);
  showDiv(box, false);
}
function selectEnd(el, x, y, ev) {
  var f = document.forms['download'];
  f.box.value = xLeft(box) + ' ' + xTop(box) + ' ' + xWidth(box) + ' ' + xHeight(box);
  f.extent.value = mf.extent.value;
  f.map_width.value = xWidth(cvs);
  f.map_height.value = xHeight(cvs);         
  setToolStatus('tool_clip', 'enabled');
}
function clipBox() {
  var q = formToQuery('download');
  window.open('download.phtml?' + q, 'download', 'width=300,height=500,resizable=yes,scrollbars=yes,toolbar=no,location=no,menubar=no,status=no');
}