function displayHideBox(boxNumber) 
{ 
    if(document.getElementById("LightBox"+boxNumber).style.display=="none") {
        document.getElementById("LightBox"+boxNumber).style.display="block";
        document.getElementById("grayBG").style.display="block"; 
    } else { 
        document.getElementById("LightBox"+boxNumber).style.display="none";
        document.getElementById("grayBG").style.display="none"; 
    } 
}