function check_form( f ) {
	  msg="";
	  var form = document.forms[f];
	  var prosessed = Array;
	  
	  for(elem in form.elements)
	    if( typeof(form.elements[elem])=='object' && isNaN(elem) && form.elements[elem]!=null && form.elements[elem].required != undefined && form.elements[elem].value=="" )
	    	msg+=form.elements[elem].title+"\n";
	    
	  if( msg != "" ){
	    msg = "Вы не заполнили следующие обязательные поля:\n---------------------------------------------------------------\n"+msg;
	    alert(msg);
	    return false;
	  }
	
	  return true;
	}