function change_img(img)
{
	document.obr.src='/UserFiles/Image/' + img;
}
function testujodp(lang)
{
 var fm = document.forms.form1;	
 if(fm.odp[0].checked || fm.odp[1].checked || fm.odp[2].checked || fm.odp[3].checked)
  document.form1.submit();
 else
 {
 	switch(lang)
	{
	 case 'fr': alert('choisissez une réponse'); 
	  break;
	 case 'en': alert('Please check an answer'); 
	  break;
	 default: alert('Please check an answer');
	}
 }
}

function potwierdz()
{
	if (confirm("Are you sure?"))
		return true;
	return false;
}