function kontrola(formular) {

  if (formular.message.value=="") {
    alert("Musíte vyplnit vzkaz!");
    formular.message.focus();
    return false;
  }
  else if (formular.odesilatel.value!="")
  {
	  if (window.RegExp) {
    re = new RegExp("^[^@]+@[^.]+\..+$");
    if (!re.test(formular.odesilatel.value)) {
      alert("Zadaná adresa není správnou adresou elektronické pošty!");
      formular.odesilatel.focus();
      return false;
    }
  }
  }

  else {
    return true;
  }
}

function openWindow() {
    newwin=window.open('','okno','menubar=0,location=0,scrollbars=yes,width=540,height=540,resizable=1,top=0');
}

  function testSubmit(form) {
    if (form.jmeno.value == "")
       alert("Musíte zadat jméno !");
    else if (form.telefon.value == "")
       alert("Musíte zadat telefon !");
    else if (form.zprava.value == "")
       alert("Musíte zadat zprávu !");
    else
        form.submit();
  }
  
  
  function zmenaDat(form) {

   if (form.varianta[0].checked) {
       form.origmaxwidth.value=280
       form.origmaxheight.value=400
       form.thumbmaxwidth.value=170
       form.thumbmaxheight.value=110
   }
   else if (form.varianta[1].checked) {
          form.origmaxwidth.value=500
          form.origmaxheight.value=500
          form.thumbmaxwidth.value=160
          form.thumbmaxheight.value=102
   }
  }
  
  
  
function onImageA() 
   {   document.box1.src = "http://new.sfactory.cz/akpa/images/box-internet-rollover.gif"; }
function offImageA() 
   {  document.box1.src = "http://new.sfactory.cz/akpa/images/box-internet.gif"; }
   
function onImageB() 
   {   document.box2.src = "http://new.sfactory.cz/akpa/images/box-intranet-rollover.gif"; }
function offImageB() 
   {  document.box2.src = "http://new.sfactory.cz/akpa/images/box-intranet.gif"; }

function onImageC() 
   {   document.box3.src = "http://new.sfactory.cz/akpa/images/box-grafika-rollover.gif"; }     
function offImageC() 
   {  document.box3.src = "http://new.sfactory.cz/akpa/images/box-grafika.gif"; }


function onImage1() 
   {   document.menu1.src = "http://new.sfactory.cz/akpa/images/O-NAS1.gif"; }
function offImage1() 
   {  document.menu1.src = "http://new.sfactory.cz/akpa/images/O-NAS.gif"; }
   
function onImage2() 
   {   document.menu2.src = "http://new.sfactory.cz/akpa/images/INTERNET1.gif"; }
function offImage2() 
   {  document.menu2.src = "http://new.sfactory.cz/akpa/images/INTERNET.gif"; }

function onImage3() 
   {   document.menu3.src = "http://new.sfactory.cz/akpa/images/INTRANET1.gif"; }     
function offImage3() 
   {  document.menu3.src = "http://new.sfactory.cz/akpa/images/INTRANET.gif"; }
  
function onImage4() 
   {   document.menu4.src = "http://new.sfactory.cz/akpa/images/GRAFIKA1.gif"; }     
function offImage4() 
   {  document.menu4.src = "http://new.sfactory.cz/akpa/images/GRAFIKA.gif"; }