function externalLinks() {
       if( ! document.getElementsByTagName )
           return;

   var anchors = document.getElementsByTagName( "a" );
        for (var i=0; i<anchors.length; i++) {
                  var anchor = anchors[i];
                  if( anchor.getAttribute( "href" ) && anchor.getAttribute( "rel" ) == "external" )
                    anchor.target = "_blank";
        }




var nVer = navigator.appVersion;
var nAgt = navigator.userAgent;
var browserName  = '';
var fullVersion  = 0; 
var majorVersion = 0;

var browser=false;

// In Internet Explorer, the true version is after "MSIE" in userAgent
if ((verOffset=nAgt.indexOf("MSIE"))!=-1) {
 browser='ie';
}

// In Opera, the true version is after "Opera" 
else if ((verOffset=nAgt.indexOf("Opera"))!=-1) {
 browser='opera';
}

// In most other browsers, "name/version" is at the end of userAgent 
else if ( (nameOffset=nAgt.lastIndexOf(' ')+1) < (verOffset=nAgt.lastIndexOf('/')) ) 
{
 browser= nAgt.substring(nameOffset,verOffset);
}

// Finally, if no name and/or no version detected from userAgent...
if (browserName.toLowerCase() == browserName.toUpperCase()
 || fullVersion==0 || majorVersion == 0 )
{
 browser  = navigator.appName;
}

//alert(browser);
		
		//IE
		var galcss=document.styleSheets[3];
		
		if(browser=='ie' || browser=='Microsoft Internet Explorer')
		{
		galcss.addRule(".opacityit img","filter:alpha(opacity=40);-moz-opacity: 0.4;",0);
		galcss.addRule(".opacityit:hover img","filter:alpha(opacity=100);-moz-opacity: 1;",1);
		galcss.addRule(".chck img","filter:alpha(opacity=100); -moz-opacity: 1;",2);
		}
		else if(browser=='Netscape')
		{
		//FF/NS
		
		galcss.insertRule(".opacityit img{filter:alpha(opacity=40);-moz-opacity: 0.4;}",1);
		galcss.insertRule(".opacityit:hover img{filter:alpha(opacity=100);-moz-opacity: 1;}",1);
		galcss.insertRule(".chck img{ filter:alpha(opacity=100); -moz-opacity: 1;}",1);
		}
	
}

//window.onload = externalLinks;

function grafika(img,xx,yy)
{
  var okno=null;
  var xx2=xx+8;
  var yy2=yy+8;
  var x_pos=(screen.width/2-xx2/2);
  var y_pos=((screen.height-80)/2-yy2/2);
  if (y_pos<0) y_pos=0;
  okno=window.open('','','toolbar=no,menubar=no,location=no,personalbar=no,scrollbars=no,status=no,directories=no,resizable=yes,copyhistory=no,width='+xx2+',height='+yy2+',left='+x_pos+',top='+y_pos);
  okno.document.open();
  okno.document.write('<html><head><title>Obrazek</title></head><body style="margin: 4px; padding: 0px;" ><center><img src="gallery/img/'+img+'" border="0" onmouseover="style.cursor=\'pointer\';" onclick="window.close();"></center></html>');
  okno.document.close();
}
