.desktop{
        display: block;
}
.mobile{
        display: none; 
}
.sitecontent   
 {      
      width: 780px;          
 }
.tdleftmenu
{
    width: 153px;                      
}
.tdcontent
{
    width: 624px;
}
.middletablecontent    
    {
        width: 780px;        
    }
    
@media screen and (max-width:900px) {	                        
        .desktop{
                display: none; 
        }
        .mobile{                                 
                display: block;       
                left: 0;
                right: 0;                  
        }     
     .sitecontent   
     {
         width: 95%;
         padding-left:1px;
         padding-right:1px;         
     }      
    
    .tdleftmenu
    {
        width: 1px;                      
    }
    .tdcontent
    {
        width: 99%
    }

     .middletablecontent    
    {
        width: 100%;        
    }
     
     
                               
}