function wopen(url,name,w,h){    
    w+=32;
    h+=96;
    wleft = (screen.width-w)/2;
    wtop = (screen.height-h)/2;    
    if(wleft<0){
       w = screen.width;
       wleft = 0;
    }
    if(wtop<0){
       h = screen.height;
       top = 0;
    }
    var win = window.open(url,name,'width='+w+',height='+h+','+'left='+wleft+',top='+wtop+','+'location=no,menubar=no,'+'status=no,toolbar=no,scrollbars=yes,resizable=yes');    
    win.resizeTo(w,h);    
    win.moveTo(wleft,wtop);
    win.focus();
}