function check_search_form(){

	   if(($('postnummer_by').value.length > 0 && $('postnummer_by').value.length < 4) || ( isNaN($('postnummer_by').substr(0,4))))
           return false; 
       else if ( $('adresse').value.lastIndexOf(" ") + 1 == $('adresse').value.length)
            return false;	
       else
            return true;
	}