var maskObj;
    var bookObj;
    var frmName = "booking";
    function createMask()
    {
        maskObj = document.createElement("div");
        maskObj.className = "mask";
        maskObj.style.width = document.documentElement.scrollWidth+"px";
        maskObj.style.height = document.documentElement.scrollHeight+50+"px";
    }
    function createBook(houseid,date1,date2,isEbooking)
    {
        bookObj = document.createElement("div");
        bookObj.id = "bookbox";
        bookObj.style.position = "absolute";
        bookObj.style.zIndex = "2";
        bookObj.style.left = "200px";
        bookObj.style.top = document.documentElement.scrollTop+document.documentElement.clientHeight/2+"px";
        bookObj.innerHTML = '<iframe name="Booking" src="/Booking1.aspx?HouseID='+houseid+'&DATE_FROM='+date1+'&DATE_TO='+date2+'&isEbooking='+isEbooking+'&r='+Math.random()+'" frameborder="0" scrolling="no" width="650" height="242"></iframe>';
    }
    function showBook(houseid,date1,date2,isEbooking)
    {
        if(!maskObj) createMask();
        document.body.appendChild(maskObj);
        createBook(houseid,date1,date2,isEbooking);
        document.body.appendChild(bookObj);
    }
    function hideBook()
    {
        if(document.body.hasChildNodes(bookObj))
           document.body.removeChild(bookObj);
        if(document.body.hasChildNodes(maskObj))
           document.body.removeChild(maskObj); 
    }