function Guid() { return S4()+S4()+S4()+S4()+S4()+S4()+S4()+S4(); } 
  
  
function S4() {return (((1+Math.random())*0x10000)|0).toString(16).substring(1) } 
  

if (navigator.cookieEnabled) 
{ 

         if (document.cookie.lastIndexOf('o2.ad.session') == -1) 

         { 
		var newCookie = "o2.ad.session=id="+Guid(); 
		if(document.cookie) 
		{ 
		newCookie += '; '; 
		} 
                document.cookie = newCookie + document.cookie;                      } 

}    
  
var info = (navigator.cookieEnabled == true) ? '' : '&info=nocookies'; 
         
function placeholder(theme, position, format, width, height) 
{ 
        document.write('<IFRAME WIDTH='+width+' HEIGHT='+height+' MARGINWIDTH=0 MARGINHEIGHT=0 FRAMEBORDER=0 HSPACE=0 VSPACE=0 SCROLLING=no'); 
        document.write(' SRC="http://ad.o2active.cz/ad.aspx?theme='+theme+'&position='+position+'&format='+format+info+'">\n'); 
	document.write('</IFRAME>');
}