$.fn.centerInClient = function(options) {
    /// <summary>Centers the selected items in the browser window. Takes into account scroll position.
    /// Ideally the selected set should only match a single element.
    /// </summary>    
    /// <param name="fn" type="Function">Optional function called when centering is complete. Passed DOM element as parameter</param>    
    /// <param name="forceAbsolute" type="Boolean">if true forces the element to be removed from the document flow 
    ///  and attached to the body element to ensure proper absolute positioning. 
    /// Be aware that this may cause ID hierachy for CSS styles to be affected.
    /// </param>
    /// <returns type="jQuery" />
    var opt = { forceAbsolute: false,
                container: window,    // selector of element to center in
                completeHandler: null
              };
    $.extend(opt, options);
   
    return this.each(function(i) {
        var el = $(this);
        var jWin = $(opt.container);
        var isWin = opt.container == window;

        // force to the top of document to ENSURE that 
        // document absolute positioning is available
        if (opt.forceAbsolute) {
            if (isWin)
                el.remove().appendTo("body");
            else
                el.remove().appendTo(jWin.get(0));
        }

        // have to make absolute
        el.css("position", "absolute");

        // height is off a bit so fudge it
        var heightFudge = isWin ? 2.0 : 1.8;

        var x = (isWin ? jWin.width() : jWin.outerWidth()) / 2 - el.outerWidth() / 2;
        var y = (isWin ? jWin.height() : jWin.outerHeight()) / heightFudge - el.outerHeight() / 2;

        el.css("left", x + jWin.scrollLeft());
        el.css("top", y + jWin.scrollTop());

        // if specified make callback and pass element
        if (opt.completeHandler)
            opt.completeHandler(this);
    });
}

var popupId = '';

function loadGMap(mId) {
	if (popupId == '') {
		$("#backgroundPopup").css( {
			"opacity" : "0.7"
		});
		$("#backgroundPopup").fadeIn("slow");
		$("#popupGMap"+mId).fadeIn("slow");
		popupId = mId;
	}
}

function enableGMap(mId) {
   // centering with css
   centerGMap(mId);
   // load popup
   loadGMap(mId);
}

function disableGMap() {
	if (popupId != '') {
		$("#backgroundPopup").fadeOut("slow");
		$("#popupGMap"+popupId).fadeOut("slow");
		popupId = '';
	}
}

function centerGMap(mId) {
       $("#popupGMap"+mId).centerInClient();
	var windowHeight = document.documentElement.clientHeight;
	// only need force for IE6
	$("#backgroundPopup").css( {
		"height" : windowHeight
	});

}

$(document).ready(function() {
		// CLOSING POPUP
		// Click out event!
		$("#backgroundPopup").click(function() {
			disableGMap();
		});
		// Press Escape event!
		$(document).keypress(function(e) {
			if (e.keyCode == 27 && popupId != '') {
				disableGMap();
			}
		});
		// Scroll event!
		$(window).scroll(function () { 
			if (popupId != '') {
				centerGMap(popupId); 
			}
		});
	});