function win_open(fn,wx,wy,bana){
x=(screen.width - wx)/2;
y=(screen.width - wy)/2;
if(bana=='ture'){
window.open(fn,"ank","toolbar=no,location=yes,directories=yes,scrollbars=yes,resizable=yes,left="+x+",top=0,width="+wx+",height="+wy);
}else{window.open(fn,"ank","toolbar=no,location=no,directories=no,left="+x+",top=0,width="+wx+",height="+wy);}

}