var isDOM=(document.getElementById)?true:false;
var isMSIE=(document.all)?true:false;

function getElement(arg) {
  if (isDOM) { return(document.getElementById(arg)); }
  else if (isMSIE) { return(document.all[arg]); }
  else { return(false); }
}

function formatCurrency(arg) {

	var iCur=Math.round(arg*10)/10;
	var sCur=new String(iCur);

	sCur=sCur.replace('.',',');
	pos=sCur.indexOf(',');

	if (pos==-1) {
		sRes=sCur+',00 Kč';
	} else if (pos==(sCur.length-2)) {
		sRes=sCur+'0 Kč';
	} else {
		sRes=sCur+' Kč';
	}

	return sRes;
}

function getCheckedRadioValue(radio) {
  for (var i=0; i < radio.length; i++) {
   if (radio[i].checked) {return radio[i].value};
  }
  return 0;
}

function isEmptyValue(arg){
  return(arg.replace(/\s/g,'')=='');
}

function isNumericValue(arg){
  var result=false;
  if (/^\d+(\.\d{2})$/.test(arg)) { result=true; }
  if (/^\d+(\,\d{2})$/.test(arg)) { result=true; }
  if (/^\d+$/.test(arg)) { result=true; }
  return result;
}

function firmaClick(arg){
  firma0_item=getElement('firma0');
  firma1_item=getElement('firma1');
  firma2_item=getElement('firma2');
  firma3_item=getElement('firma3');
  if (arg=='2') {
     firma0_item.style.display='';
     firma1_item.style.display='';
     firma2_item.style.display='';
     firma3_item.style.display='';
  } else {
     firma0_item.style.display='none';
     firma1_item.style.display='none';
     firma2_item.style.display='none';
     firma3_item.style.display='none';
  }
}

function showFoto(arg) {
  window.open('/foto/'+arg,'info','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=no,width=620,height=650');
}

function addToCart(kod) {
  f=document.forms['formRegal'];
  kusu=f.elements['kusu'+kod].value;
  if (!isNumericValue(kusu)) {
     alert('Nebyla zadána platná číslice!');
  } else {
     location.href='/kosik.php?kod='+kod+'&kusu='+kusu+'&act=insert&';
  }
}