/* Z-index of #mask must lower than #boxes .window */  
 #mask {  
   position:absolute;  
   z-index:9000;  
   background-color:#dcdcdc;  
   display:none; 	
   top:0;
   left:0;
 
 }  
     
 #boxes .window {  
   position:absolute;  
   width:500px;  
   height:auto;  
   display:none;  
   z-index:9999;  
   padding:15px;
   background-color: #ffffff;  
 }  
   
   
 /* Customize your modal window here, you can add background image too */  
 #boxes #dialog {  
   width:375px;   
   height:203px;  
 }