var lastclicked = "";
function subnavin(txt){
		  if(lastclicked!=txt){
		    var img_new = (document.getElementById) ? document.getElementById(txt) : eval("document.all['" + txt + "']");
		    img_new.src="img/"+txt+"_b.jpg";
		  }
}
function subnavout(txt){
		  if(lastclicked!=txt){
		    var img_new = (document.getElementById) ? document.getElementById(txt) : eval("document.all['" + txt + "']");
		    img_new.src="img/"+txt+"_a.jpg";
		  }
}
function subnavclick(txt,num){
		  var img_new = (document.getElementById) ? document.getElementById(txt) : eval("document.all['" + txt + "']");
		  img_new.src="img/"+txt+"_b.jpg";
		  if(lastclicked!=""){
		    var img_new_old = (document.getElementById) ? document.getElementById(lastclicked) : eval("document.all['" + lastclicked + "']");
		    img_new_old.src="img/"+lastclicked+"_a.jpg";
		  }
		  var content = (document.getElementById) ? document.getElementById("content") : eval("document.all['content']");
		  content.src="htmlcontent/"+txt+".htm";
		  lastclicked=txt;
		  fkt_click(num,'0');
}