function validate_required(field,alerttxt) {
      with (field) {
      if (value==null||value=="") {
         alert(alerttxt);return false;
      } else {
         return true;
      }
   }
}

function validate_form(thisform) {
   for (var i in thisform.elements) {
      var thisvar=new String(thisform.elements[i].name);
      if (thisvar.match("_require")) {
         if (validate_required(thisform.elements[i],"You missed a required entry...")==false) {
            thisform.elements[i].focus();
            return false; 
         }
      }
   }
   return true;
}