jQuery.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
              };
    jQuery.extend(opt, options);
   
    return this.each(function(i) {
        var el = jQuery(this);
        var jWin = jQuery(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);
    });
}






//SETTING UP OUR POPUP  
//0 means disabled; 1 means enabled;  
  var popupStatus = 0;  
  
  //loading
function loadPopup(){
//loads popup only if it is disabled
if(popupStatus==0){
	
jQuery("#backgroundPopup").css({
"opacity": "0.7"

});
jQuery("#backgroundPopup").fadeIn("slow");
jQuery("#popupContact").fadeIn("slow");
popupStatus = 1;
}
}

//disabling popup 
function disablePopup(){
//disables popup only if it is enabled
if(popupStatus==1){
	jQuery("#popupContact").fadeOut("slow");
	jQuery("#popupContact").empty() 
jQuery("#backgroundPopup").fadeOut("slow");


popupStatus = 0;
}
}

//centering popup
function centerPopup(){
//request data for centering
var windowWidth = document.documentElement.clientWidth;
var windowHeight = document.documentElement.clientHeight;
var popupHeight = jQuery("#popupContact").height();
var popupWidth = jQuery("#popupContact").width();
//centering
jQuery("#popupContact").css({
"position": "absolute",
"top": windowHeight/2-popupHeight/2,
"left": windowWidth/2-popupWidth/2
});
//only need force for IE6

jQuery("#backgroundPopup").css({
"height": windowHeight
});

}