var detect = navigator.userAgent.toLowerCase();
var OS,browser,version;
var version,total,thestring;

function DetectBrowser()
 {

   if (checkIt('konqueror'))
    {
      browser = "Konqueror";
      OS = "Linux";
    } else if (checkIt('safari')) browser = "Safari"
      else if (checkIt('omniweb')) browser = "OmniWeb"
      else if (checkIt('opera')) browser = "Opera"
      else if (checkIt('webtv')) browser = "WebTV";
      else if (checkIt('icab')) browser = "iCab"
      else if (checkIt('msie')) browser = "Internet Explorer"
      else 
       if (!checkIt('compatible'))
        {
          browser = "Netscape Navigator"
	  version = detect.charAt(8);
        }
         else 
        {
          browser = "An unknown browser";
        }

   if (!version) version = detect.charAt(place + thestring.length);
   if (!OS)
    {
      if (checkIt('linux')) OS = "Linux";
	else if (checkIt('x11')) OS = "Unix";
	else if (checkIt('mac')) OS = "Mac"
	else if (checkIt('win')) OS = "Windows"
	else OS="an unknown operating system";
    }
 }

function checkIt(string)
 {
   place = detect.indexOf(string) + 1;
   thestring = string;
   return place
 }

function CenteredOpenWin(linka,win_w,win_h,name,settings)
 {
   DetectBrowser();
   var sw=screen.width;
   var hw=screen.height;
   if (browser=="Internet Explorer")  { win_w=win_w-4; win_h=win_h-3; }
    // nem akkora ablakot nyit meg mint kene
   var settings="scrollbars=no,width="+win_w+",height="+win_h+",";
//   alert(hw);
//   alert(win_h);
   var bal_felso_x=(sw-win_w)/2-4; 
   if (browser=="Opera")  
    { 
      var bal_felso_y=((hw-50)-win_h)/2-100;
    } else
    {
      var bal_felso_y=((hw-50)-win_h)/2-2;
    }
   if (bal_felso_x<0) { bal_felso_x=0; }
   if (bal_felso_y<0) { bal_felso_y=0; }
   if (browser=="Netscape Navigator")
    { settings+="screenX="+bal_felso_x+",screenY="+bal_felso_y; } else
    { settings+="left="+bal_felso_x+",top="+bal_felso_y; } 
//   alert(name);
   x=window.open(linka,name,settings);
 }