//SETTING UP OUR POPUP
//0 means disabled; 1 means enabled;
var popupStatus = 0;

//loading popup with jQuery magic!
function loadPopup() {
  //loads popup only if it is disabled
  if(popupStatus==0) {
    $("#backgroundPopup").css({"opacity":"0.7"});
	$("#backgroundPopup").fadeIn("slow");
	$("#popup-image-container").fadeIn("slow");
	popupStatus = 1;
  }
}

//disabling popup with jQuery magic!
function disablePopup() {
  //disables popup only if it is enabled
  if(popupStatus==1) {
    $("#backgroundPopup").fadeOut("slow");
	$("#popup-image-container").fadeOut("slow");
	popupStatus = 0;
  }
}

//centering popup
function centerPopup() {
  //request data for centering
  var windowWidth = document.documentElement.clientWidth;
  var windowHeight = document.documentElement.clientHeight;
  var popupHeight = $("#popup-image-container").height();
  var popupWidth = $("#popup-image-container").width();

  //centering
  $("#popup-image-container").css({
    "position": "absolute",
	"top": windowHeight/2-popupHeight/2,
	"left": windowWidth/2-popupWidth/2
  });

  //only need force for IE6
  $("#backgroundPopup").css({
    "height": windowHeight
  });
}