function checkForm()
{
  required = new Array(
    		'who','cont', 'what');
  required_show = new Array(
		"?????????? ????",'????????','????? ?????????');
  var i, j;
  for(j=0; j<required.length; j++) {
    for (i=0; i<document.forms.form1.length; i++) {
        if (document.forms.form1.elements[i].name == required[j] && document.forms.form1.elements[i].value == "" )
	{
            alert('??????????, ????????? ???? ' + required_show[j]);
            document.forms.form1.elements[i].focus();
            return false;
        }
    }
  }
return true;
}