var GB_DONE = false;
var GB_HEIGHT = 400;
var GB_WIDTH = 400;

function GB_show(caption, url, height, width) {
  GB_HEIGHT = height || 400;
  GB_WIDTH = width || 400;
  if(!GB_DONE) {
    $j(document.body)
      .append("<div id='GB_overlay'></div><div id='GB_window'><div id='GB_caption'></div>"+ "<img src='/images/close.gif' alt='Close window'/></div>");
    $j("#GB_window img").click(GB_hide);
    $j("#GB_overlay").click(GB_hide);
    $j(window).resize(GB_position);
    GB_DONE = true;
  }

  $j("#GB_frame").remove();
  $j("#GB_window").append("<iframe id='GB_frame' src='"+url+"'></iframe>");

  $j("#GB_caption").html(caption);
  $j("#GB_overlay").slideDown("normal");
  GB_position();
  $j("#GB_window").slideDown("normal");
}

function GB_hide() {
  $j("#GB_window,#GB_overlay").hide();
}

function GB_position() {
  var de = document.documentElement;
  var w = self.innerWidth || (de&&de.clientWidth) || document.body.clientWidth;
  try {
	  $j("#GB_window").css({width:GB_WIDTH+"px",height:GB_HEIGHT+"px",left: ((w - GB_WIDTH)/2)+"px" });
	  $j("#GB_frame").css("height",GB_HEIGHT - 32 +"px");
  } catch (e) {
  }
}