var agOK=0;
     if (navigator.userAgent.indexOf("Mozilla/3")!=-1) agOK=0;
else if (navigator.userAgent.indexOf("Mozilla/4")!=-1) agOK=1;
else if (navigator.userAgent.indexOf("Mozilla/5")!=-1) agOK=1;

if (agOK)
{
 EN0=new Image(200,90); EN0.src="/kurzy/logo_en.gif"; 
 CZ0=new Image(200,90); CZ0.src="/kurzy/logo_cz.gif"; 
 a10=new Image(74,19);  a10.src="/kurzy/info.gif"; 
 EN20=new Image(74,19); EN20.src="/kurzy/mailing_en.gif"; 
 CZ20=new Image(74,19); CZ20.src="/kurzy/mailing_cz.gif"; 

 EN1=new Image(200,90); EN1.src="/kurzy/logo_cz.gif"; 
 CZ1=new Image(200,90); CZ1.src="/kurzy/logo_en.gif"; 
 a11=new Image(74,19);  a11.src="/kurzy/info2.gif"; 
 EN21=new Image(74,19); EN21.src="/kurzy/mailing2.gif"; 
 CZ21=new Image(74,19); CZ21.src="/kurzy/mailing2.gif"; 
}
function img0(nm){if (agOK && document.images){img=eval(nm+"0.src"); document[nm].src=img;}}
function img1(nm){if (agOK && document.images){document[nm].src=a11.src;}}
function img2(nm){if (agOK && document.images){img=eval(nm+"1.src"); document[nm].src=img;}}

function resetSlct(on)
{for (var i=0; i<document.xcForm.length; i++)  
  {if (document.xcForm.elements[i].name.search('x') != -1)
    {document.xcForm.elements[i].checked = on;}
  }
}