var opened = false;
var nome = "";
function NewWindow(mypage,myname,w,h,scroll){
if(mypage.indexOf('f=file.jpg') == -1){

if(opened && nome == myname){win.close();opened = false;}
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings =
'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',status=no, toolbar=no'
win = window.open(mypage,myname,settings);
nome = myname;
opened = true;
if(win.window.focus){win.window.focus();}

}
}