var win = null;
function displayWindow(mypage,myname,w,h,scroll){
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+',noresizable'
win = window.open(mypage,'null', settings);
win.focus();
}

function popup_game(path_file, title_name) {
displayWindow(path_file,title_name,'820','620','1');void(0);
}