var de = document.documentElement;
var GB_DONE = false;
var GB_HEIGHT = (self.innerHeight || (de&&de.clientHeight) || document.body.clientHeight)-100;
var GB_WIDTH = (self.innerWidth || (de&&de.clientWidth) || document.body.clientWidth)-100;
var GB_TOP = 0;
var GB_LEFT= 0;

function GB_show(caption, url, height, width,top,left) {

 
GB_HEIGHT = (self.innerHeight || (de&&de.clientHeight) || document.body.clientHeight)-100;
GB_WIDTH = (self.innerWidth || (de&&de.clientWidth) || document.body.clientWidth)-100;
GB_TOP = 0;
GB_LEFT= 0;

  GB_HEIGHT = height || GB_HEIGHT;
  GB_WIDTH = width || GB_WIDTH;
  GB_TOP = top || 0;
  GB_LEFT= left || 0;
  if(!GB_DONE) {
    $(document.body)
      .append("<div id='GB_overlay'></div><div id='GB_window'><div id='GB_caption'></div>"
        + "<img src='/feltrinelli-img/img/close_jq.gif' alt='chiudi / close'/></div>");
    $("#GB_window img").click(GB_hide);
    $("#GB_overlay").click(GB_hide);
    $(window).resize(GB_position);
    GB_DONE = true;
  }

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

  $("#GB_caption").html(caption);
  $("#GB_overlay").show();
  GB_position();

  if(GB_ANIMATION)
    $("#GB_window").slideDown("slow");
  else
    $("#GB_window").show();
}

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

function GB_position() {
 
 

  var de = document.documentElement;
  var w = self.innerWidth || (de&&de.clientWidth) || document.body.clientWidth;
  


  $("#GB_window").css({width:GB_WIDTH+"px",height:GB_HEIGHT+"px",
    left: ((GB_LEFT - GB_WIDTH - 20))+"px" });
  $("#GB_frame").css("height",GB_HEIGHT - 32 +"px");
  $("#GB_window").css("top",GB_TOP-GB_HEIGHT/2 +"px");
}