function checkForm(form)
{
  var str = "";
  var snr = "";
  ok = true;
  
	k = form.elements.length;
	for (i=0;i<k; i++)
	{ 
		str = form.elements[i].name;
		if ((form.elements[i].value == "" || form.elements[i].value ==null) && str.indexOf("*") > -1 || (form.elements[i].value=="OK" && !form.elements[i].checked))
		{
			alert("Bitte füllen Sie das Feld \"" + str + "\" aus!");
			if ( parseInt(navigator.appVersion) >= 4 || navigator.appName == "Netscape")
			{
				form.elements[i].focus();
			}
			return false;
		}
	}
	return ok;
}