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

    //disabling popup with jQuery magic!  
    function disablePopup(){  
    //disables popup only if it is enabled  
    if(popupStatus==1){  
    $("#backgroundPopup").slideUp("slow");  
    $("#popupContact").slideUp("slow");  
    popupStatus = 0;  
    }  
    }
    
    //centering popup  
    function centerPopup(){  
    //request data for centering  
    var windowWidth = document.documentElement.clientWidth;  
    var windowHeight = document.documentElement.clientHeight;  
    var popupHeight = $("#popupContact").height();  
    var popupWidth = $("#popupContact").width();  
    //centering  
    $("#popupContact").css({  
    "position": "absolute",  
    "top": windowHeight/2-popupHeight/2,  
    "left": windowWidth/2-popupWidth/2  
    });  
    //only need force for IE6  
      
    $("#backgroundPopup").css({  
    "height": windowHeight  
    });  
      
    }