// JavaScript Document
function updateOrientation(){  
        var contentType = "show_";  
        switch(window.orientation){  
            case 0:  
            contentType += "normal";  
            break;  
      
            case -90:  
            contentType += "right";  
           break;  
     
           case 90:  
           contentType += "left";  
           break;  
     
           case 180:  
           contentType += "flipped";  
           break;  
       }  
   document.getElementById("page_wrapper").setAttribute("class", contentType);  
   }