function changeCategory(id) {

  // current cat
  // todo reset current (pozor na posledni)
  if (currentcat > 0) {
    
    if (currentcat > 1) {
      document.getElementById('levelzero'+ (currentcat-1)).className='';
    }
    document.getElementById('levelzero'+ currentcat).className='';
    document.getElementById('levellink'+ currentcat).className='';
    document.getElementById('levelone'+ currentcat).style.display='none';
    if (currentcat == totalcats) {
    document.getElementById('levelzero'+ currentcat).className='posledni';
    }
  }
  
  if (currentcat != id) {
    // set cat
    if (id > 1) {
      document.getElementById('levelzero'+ (id-1)).className='posledni';
    }
    document.getElementById('levelzero'+ id).className='aktive';
    document.getElementById('levellink'+ id).className='aktive';
    document.getElementById('levelone'+ id).style.display='block';
    currentcat = id;

  } else {
    currentcat = 0;
  }
}

var mnfchooserstatus = false;

function activateMnfChooser() {
  mnfchooserstatus = true;
  document.getElementById('mnfchooser').innerHTML='<a href="javascript:launchMnfChooser();">Zobrazit!</a>';
  document.getElementById('mnfchooser').className='pata-common pata-2';
}

function launchMnfChooser() {
  document.forms["manufacturer"].submit();
}











var catmem = Array();

function switchCat(categoryid) {
  element = document.getElementById('cat'+categoryid);
	if (catmem[categoryid]!='1') {
		element.className+=" active";
		catmem[categoryid] = 1;
	} else {
    //element.className.replace(" active", "");  
		element.className="";
		catmem[categoryid] = 0;
	}
}

function changeElementHTML(divid,code) {
	element = document.getElementById(divid);
	element.innerHTML = code;
}

function showCurrencySwitch() {
	changeElementHTML('currencyswitch','<p>Click to switch currency.</p>');
	document.getElementById('currencyswitch').className='prize hand';
}

function hideCurrencySwitch(total,currencysign) {
	changeElementHTML('currencyswitch','<p>Total price:</p><p><span class="prize">'+total+'</span> '+currencysign+'</p><p class="normal light">including VAT</p>');
}

function switchStyle(liststyle) {
	if (liststyle == 'list') {
		setCookie('liststyle','list');
	} else {
		setCookie('liststyle','detail');
	}
	window.location = categorylocation;
}

function switchSize(form) {
	var myindex=form.pocet.selectedIndex
	var myvalue=form.pocet.options[myindex].value
	if (myvalue != '-1') {
		if (currentstyle == 'list') {
			setCookie('listperpage',myvalue);
		} else {
			setCookie('detailperpage',myvalue);
		}
		window.location = categorylocation;
	}
	return true;
}

function getCookie( name ) {
	
	var start = document.cookie.indexOf( name + "=" );
	var len = start + name.length + 1;
	if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) )
	{
		return null;
	}
	if ( start == -1 ) return null;
	var end = document.cookie.indexOf( ";", len );
	if ( end == -1 ) end = document.cookie.length;
	return unescape( document.cookie.substring( len, end ) );
}

function setCookie( name, value, expires, path, domain, secure ) {
	// set time, it's in milliseconds
	var today = new Date();
	today.setTime( today.getTime() );
	// if the expires variable is set, make the correct expires time, the
	// current script below will set it for x number of days, to make it
	// for hours, delete * 24, for minutes, delete * 60 * 24
	if ( expires )
	{
		expires = expires * 1000 * 60 * 60 * 24;
	}
	//alert( 'today ' + today.toGMTString() );// this is for testing purpose only
	var expires_date = new Date( today.getTime() + (expires) );
	//alert('expires ' + expires_date.toGMTString());// this is for testing purposes only

	document.cookie = name + "=" +escape( value ) +
		( ( expires ) ? ";expires=" + expires_date.toGMTString() : "" ) + //expires.toGMTString()
		( ( path ) ? ";path=" + path : ";path=/" ) + 
		( ( domain ) ? ";domain=" + domain : "" ) +
		( ( secure ) ? ";secure" : "" );
}

function deleteCookie( name, path, domain ) {
	if ( getCookie( name ) ) document.cookie = name + "=" +
			( ( path ) ? ";path=" + path : "") +
			( ( domain ) ? ";domain=" + domain : "" ) +
			";expires=Thu, 01-Jan-1970 00:00:01 GMT";
}

function zoomPhoto(photoid) {
	open('photo.php?photoid=' + photoid,'photodetail' + photoid,'height=450,width=450,location=no,scrollbars=no,menubars=no,toolbars=no,resizable=yes');
}