function detect_browser()

{

var browser;



// FireFox

if (navigator.userAgent.toLowerCase().indexOf("firefox") > -1)

{

var start_pos = (navigator.userAgent.toLowerCase().indexOf("firefox")+8);

var end_pos = start_pos+1;

browser = "firefox" + navigator.userAgent.substring(start_pos, end_pos);

}



// Opera

else if (navigator.userAgent.toLowerCase().indexOf("opera") > -1)

{

var start_pos = (navigator.userAgent.toLowerCase().indexOf("opera")+6);

var end_pos = start_pos+4;

browser = "opera";

}



return browser;

}





function Toggle(item) {

   obj=document.getElementById(item);

   visible=(obj.style.display!="none")

   key=document.getElementById("x" + item);

   if (visible) {

     obj.style.display="none";

     key.innerHTML="<img src='/images/style/submenu/menu-closed.gif' width='16' height='16' hspace='0' vspace='0' border='0'>";

   } else {

      obj.style.display="block";

      key.innerHTML="<img src='/images/style/submenu/menu-open.gif' width='16' height='16' hspace='0' vspace='0' border='0'>";

   }

}


function emo(emo) {
	document.F.text.value += '`' + emo;
	document.F.text.focus();
	return;
} // end func

function kontrola() {
	if (!prazdneJmeno() || !prazdnaZprava()) {
		alert('Zpráva nebyla odeslána.');
		return false;
	}
	return true;
} // end func