var backImage = new Array(); 

backImage[0] = "./images/meni/meni_strelica_vox_electronics.gif";
backImage[1] = "./images/meni/meni_strelica1_vox_electronics.gif";

function changeImage(id,whichImage){

  if (document.body){
    document.getElementById("img"+id).src = backImage[whichImage];
  }
}


function checkformkontakt ( form )
{
  if (form.ime.value == "") {
    alert( "Molimo Vas unesite Ime i prezime!" );
    form.ime.focus();
    return false ;
  }
  
    if (form.telefon.value == "") {
    alert( "Molimo Vas unesite Telefon!" );
    form.telefon.focus();
    return false ;
  }
  
  
  if (form.email.value == "") {
    alert( "Molimo Vas unesite E-Mail adresu!" );
    form.email.focus();
    return false ;
  }

  if (form.email.value != "" ) {
    var x = form.email.value;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(x))
	{ alert("Molimo Vas unesite ispravnu E-Mail adresu!");
    form.email.focus();
    return false ;
	}
  }
  
    if (form.poruka.value == "") {
    alert( "Molimo Vas unesite Tekst poruke!" );
    form.poruka.focus();
    return false ;
  }
  
  if (form.captcha.value == "" ) {
    alert( "Molimo Vas unesite broj !" );
    form.captcha.focus();
    return false ;
  }

  return true ;
}