#div_screen{   background-color:#000000;   filter:alpha(opacity=40);     opacity: 0.5;        position:absolute;   top:0px;   left:0px;   width:100%;  display:none;}
#div_screen1{   background-color:#000000;   filter:alpha(opacity=40);     opacity: 0.5;        position:absolute;   top:0px;   left:0px;   width:100%;  display:none;}
#ntooltip{   position:absolute;   top:0px;   left:0px; }