function chkFormularUebung () {
 
  if (document.uebungerfassen.thema.value == "") {
    alert("Titel / Thema darf nicht leer sein!");
    document.uebungerfassen.thema.focus();
    return false;
  }
  else{return true;}
}

function chkFormularUebungedit () {
 
  if (document.edituebung.thema.value == "") {
    alert("Titel / Thema darf nicht leer sein!");
    document.edituebung.thema.focus();
    return false;
  }
  else{return true;}
}
//***************************************************************************************************//
//***************************************************************************************************//

function chkFormularaddarticle () {
  var mynumber = document.addarticle.number.value;
  var myprupie = document.addarticle.prupie.value;
  var mysrupie = document.addarticle.srupie.value;
 
  if (document.addarticle.name.value == "") {
    alert("Name missing!");
    document.addarticle.name.focus();
    return false;
  }
  if (document.addarticle.number.value == "") {
    alert("Number missing!");
    document.addarticle.number.focus();
    return false;
  }
  if (isNaN(mynumber)) {
    alert("Article Number is not a number!");
    document.addarticle.number.focus();
    return false;
  }
  if (document.addarticle.prupie.value == "") {
    alert("Purchase Price missing!");
    document.addarticle.prupie.focus();
    return false;
  }
  if (isNaN(myprupie)) {
    alert("Purchase Price is not a number!");
    document.addarticle.prupie.focus();
    return false;
  }
  if (document.addarticle.srupie.value == "") {
    alert("Selling Price missing!");
    document.addarticle.srupie.focus();
    return false;
  }
  if (isNaN(mysrupie)) {
    alert("Selling Price is not a number");
    document.addarticle.srupie.focus();
    return false;
  }
  else{return true;}
}

//***************************************************************************************************//
//***************************************************************************************************//

function chkFormularaddarticletostock () {
  var myquantity = document.addarticletostock.quantity.value;
 
  if (document.addarticletostock.quantity.value == "") {
    alert("Quantity missing!");
    document.addarticletostock.quantity.focus();
    return false;
  }
  if (isNaN(myquantity)) {
    alert("Quantity is not a number");
    document.addarticletostock.quantity.focus();
    return false;
  }
  return true;
  
}
//***************************************************************************************************//
//***************************************************************************************************//

function chkFormularaddsupplier () {
  var myzip = document.addsupplier.zip.value;
 
  if (document.addsupplier.name.value == "") {
    alert("Name missing!");
    document.addsupplier.name.focus();
    return false;
  }
  if (isNaN(myzip)) {
    alert("ZIP is not a number");
    document.addsupplier.zip.focus();
    return false;
  }
  return true;
  
}

//***************************************************************************************************//
//***************************************************************************************************//

function chkFormularaddpatient () {
  var mynumber = document.addpatient.mednr.value;
  var myage = document.addpatient.age.value;
 
  if (document.addpatient.name.value == "") {
    alert("Name missing!");
    document.addpatient.name.focus();
    return false;
  }
  if (document.addpatient.mednr.value == "") {
    alert("OP/IP number missing!");
    document.addpatient.mednr.focus();
    return false;
  }
  if (isNaN(mynumber)) {
    alert("OP/IP number is not a number");
    document.addpatient.mednr.focus();
    return false;
  }
  if (isNaN(myage)) {
    alert("Age is not a number");
    document.addpatient.age.focus();
    return false;
  }
  return true;
  
}

//***************************************************************************************************//
//***************************************************************************************************//

function chkFormulareditpatient () {
  var mynumber = document.editpatient.mednr.value;
  var myage = document.editpatient.age.value;
 
  if (document.editpatient.name.value == "") {
    alert("Name missing!");
    document.editpatient.name.focus();
    return false;
  }
  if (document.editpatient.mednr.value == "") {
    alert("OP/IP number missing!");
    document.editpatient.mednr.focus();
    return false;
  }
  if (isNaN(mynumber)) {
    alert("OP/IP number is not a number");
    document.editpatient.mednr.focus();
    return false;
  }
  if (isNaN(myage)) {
    alert("Age is not a number");
    document.editpatient.age.focus();
    return false;
  }
  return true;
  
}

//***************************************************************************************************//
//***************************************************************************************************//

function chkagecat () {
  
  var myage = document.editpatient.age.value;

  if (isNaN(myage)) {
  document.editpatient.age.focus();
  alert("Age is not a number");
  }  
  if(myage >= 0 && myage<=5){
  document.editpatient.agecat.options[0].selected=true;
  }
  if(myage >= 6 && myage<=10){
  document.editpatient.agecat.options[1].selected=true;
  }
  if(myage >= 11 && myage<=13){
  document.editpatient.agecat.options[2].selected=true;
  }
  if(myage >= 14 && myage<=20){
  document.editpatient.agecat.options[3].selected=true;
  }
  if(myage >= 21 && myage<=30){
  document.editpatient.agecat.options[4].selected=true;
  }
  if(myage >= 31 && myage<=40){
  document.editpatient.agecat.options[5].selected=true;
  }
  if(myage >= 41 && myage<=60){
  document.editpatient.agecat.options[6].selected=true;
  }
  if(myage >= 61 && myage<=80){
  document.editpatient.agecat.options[7].selected=true;
  }
  if(myage >= 81 && myage<=100){
  document.editpatient.agecat.options[8].selected=true;
  }
  if(myage > 100){
  document.editpatient.agecat.options[9].selected=true;
  }
}
//***************************************************************************************************//
//***************************************************************************************************//

function chkagecat2 () {
  
  var myage = document.addpatient.age.value;
  
  if (isNaN(myage)) {
  document.addpatient.age.focus();
  alert("Age is not a number");
  }  
  if(myage >= 0 && myage<=5){
  document.addpatient.agecat.options[0].selected=true;
  }
  if(myage >= 6 && myage<=10){
  document.addpatient.agecat.options[1].selected=true;
  }
  if(myage >= 11 && myage<=13){
  document.addpatient.agecat.options[2].selected=true;
  }
  if(myage >= 14 && myage<=20){
  document.addpatient.agecat.options[3].selected=true;
  }
  if(myage >= 21 && myage<=30){
  document.addpatient.agecat.options[4].selected=true;
  }
  if(myage >= 31 && myage<=40){
  document.addpatient.agecat.options[5].selected=true;
  }
  if(myage >= 41 && myage<=60){
  document.addpatient.agecat.options[6].selected=true;
  }
  if(myage >= 61 && myage<=80){
  document.addpatient.agecat.options[7].selected=true;
  }
  if(myage >= 81 && myage<=100){
  document.addpatient.agecat.options[8].selected=true;
  }
  if(myage > 100){
  document.addpatient.agecat.options[9].selected=true;
  }
}