var prave_zvoleny=0;
function top_clanek(uid){
	for(i=0; i<4; i++){
		var obrazek_div=document.getElementById('top_clanek_img_'+i);
		var text_div=document.getElementById('top_clanek_'+i);
		var text_img_a=document.getElementById('top_clanek_img_text_1_'+i);
		var text_img_b=document.getElementById('top_clanek_img_text_2_'+i);
		if(uid==i){
			obrazek_div.style.visibility='visible';
			text_img_a.style.visibility='visible';
			text_img_b.style.visibility='visible';
			text_div.className='topArticleItemSelected';
			prave_zvoleny=uid;
		}else{
			obrazek_div.style.visibility='hidden';
			text_img_a.style.visibility='hidden';
			text_img_b.style.visibility='hidden';
			text_div.className='topArticleItem';
		}
	}
}

function rotovani(){
	if(prave_zvoleny<3)var novy=prave_zvoleny+1;
	else var novy=0;
	top_clanek(novy);
}

function zapni_casovani(){
	casovac=window.setInterval('rotovani()',3000);
}

function zkontroluj_email(adresa) {
	re = /^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,4}$/;
  	return adresa.search(re) == 0;
}

function zkontroluj_formular(id_form) {
  	if(kontrola()==true){
	  	var email = document.getElementById("email");
	  	var formular = document.getElementById(id_form);
	  	var form_posilame = document.getElementById("posilame_zpravu");
	  	if (!zkontroluj_email(email.value)) {
	    	alert("Email není ve správném tvaru!");
	    	return false;
		 	}else {
		 		form_posilame.value=1;
		 		formular["action"]=formular["action"]+"#"+id_form;
		 		formular.submit();
		 	}
	 }else{
	 		alert("Vyplňte správně celý formulář!");
	 		return false;
	}		
}

function kontrola() {
	var jmeno = document.getElementById("jmeno");
	var email = document.getElementById("email");
	var zprava = document.getElementById("text");
	if ((jmeno.value !="")
	&& (email.value !="")
	&& (zprava.value !="")) {
		return true;
	}else{
		return false;
	}
}

function rf(ifr,idt){
	document.getElementById("img_hit").src='ref_hit.php?ifr='+ifr+'&idt='+idt;
}