function numbersonly(myfield, e, dec){
  var key;
  var keychar;
  if (window.event){
    key = window.event.keyCode;
  }else if (e){
    key = e.which;
  }else return true;
  keychar = String.fromCharCode(key);
// control keys
  if ((key==null) || (key==0) || (key==8) || (key==9) || (key==13) || (key==27)) return true;
// numbers
  else if ((("0123456789").indexOf(keychar) > -1)) return true;
// decimal point jump
  else if (dec && (keychar == ".")){
    myfield.form.elements[dec].focus();
    return false;
  }else return false;
}//-----------------------------------------------------------------------------
function numbers(field){
  var key;
  var keychar;
  if (window.event){
    key = window.event.keyCode;
  }else if (field){
    key = field.which;
  }else return true;
  keychar = String.fromCharCode(key);
// control keys
  if ((key==null) || (key==0) || (key==8) || (key==9) || (key==13) || (key==27)) return true;
// numbers
  else if ((("0123456789").indexOf(keychar) > -1)) return true;
  else{  return false;}
}//-----------------------------------------------------------------------------
function validnimail(fieldmail,fieldtelefon,fieldjmeno){
	var mail=eval(fieldmail).value;
	var telefon=eval(fieldtelefon).value;
	var jmeno=eval(fieldjmeno).value;
	if(jmeno=='' || jmeno==undefined){
		alert('Zadejte svoje jmeno!!');
		return false;
	}else if(telefon=='' || telefon==undefined || telefon.length<9){
		if(mail=='' || mail==undefined || mail.indexOf('@')==-1 || mail.indexOf('@')==0 || mail.indexOf('.')==-1 || mail.indexOf('.')==0 || mail.indexOf('.')==mail.length-1){
			alert('Zadejte spravne email! Nebo vyplnte telefon.');
			return false;
		}
	}
}
//-----------------------------------------------------------------------------
function confirmbox(tex){
  input_box=confirm("Opravdu si prejete smazat  "+tex+"?");
  if (input_box==true){
    retvalue=false;
  }else{
    retvalue=true;
  }
  return retvalue;
}//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
function hidediv(idel,visib) {
    if (document.getElementById) { // DOM3 = IE5, NS6
      document.getElementById(idel).style.visibility = visib;
    }else {
      if (document.layers) { // Netscape 4
        document.eval(idel).visibility = visib;
      }else { // IE 4
        document.all.eval(idel).style.visibility = visib;
      }
    }
}
//-----------------------------------------------------------------------------
function CenterWin(theURL) {
   var x=(screen.width-320)/2;
   var y=(screen.height-240)/2;
   //winpa='\'height='+he+',width='+wi+',top='+y+',left='+x;
   aaa = window.open("popup.htm?"+theURL,"obrazek",'height=320,width=240,top='+y+',left='+x+',resizable=yes,scrollbars=no,status=no');
   aaa.focus();
   return true;
}