--- src/libs/zbxserver/evalfunc.c.org	2009-09-22 13:21:37.000000000 +0000
+++ src/libs/zbxserver/evalfunc.c	2009-09-22 13:38:33.000000000 +0000
@@ -633,45 +633,62 @@
 	default:
 		return FAIL;
 	}
-
-	switch (num) {
-	case 1:
-		if (1 != item->lastvalue_null)
-		{
-			switch (item->value_type) {
-			case ITEM_VALUE_TYPE_FLOAT:
-				zbx_snprintf(value, MAX_STRING_LEN, ZBX_FS_DBL, item->lastvalue_dbl);
-				del_zeroes(value);
-				break;
-			case ITEM_VALUE_TYPE_UINT64:
-				zbx_snprintf(value, MAX_STRING_LEN, ZBX_FS_UI64, item->lastvalue_uint64);
-				break;
-			default:
-				zbx_snprintf(value, MAX_STRING_LEN, "%s", item->lastvalue_str);
-				break;
-			}
-			ret = SUCCEED;
-		}
-		break;
-	case 2:
-		if (1 != item->prevvalue_null)
-		{
-			switch (item->value_type) {
-			case ITEM_VALUE_TYPE_FLOAT:
-				zbx_snprintf(value, MAX_STRING_LEN, ZBX_FS_DBL, item->prevvalue_dbl);
-				del_zeroes(value);
+	if( ITEM_VALUE_TYPE_TEXT != item->value_type ) {
+		switch (num) {
+			case 1:
+				if (1 != item->lastvalue_null)
+				{
+					switch (item->value_type) {
+						case ITEM_VALUE_TYPE_FLOAT:
+							zbx_snprintf(value, MAX_STRING_LEN, ZBX_FS_DBL, item->lastvalue_dbl);
+							del_zeroes(value);
+							break;
+						case ITEM_VALUE_TYPE_UINT64:
+							zbx_snprintf(value, MAX_STRING_LEN, ZBX_FS_UI64, item->lastvalue_uint64);
+							break;
+						default:
+							zbx_snprintf(value, MAX_STRING_LEN, "%s", item->lastvalue_str);
+							break;
+					}
+					ret = SUCCEED;
+				}
 				break;
-			case ITEM_VALUE_TYPE_UINT64:
-				zbx_snprintf(value, MAX_STRING_LEN, ZBX_FS_UI64, item->prevvalue_uint64);
+			case 2:
+				if (1 != item->prevvalue_null)
+				{
+					switch (item->value_type) {
+						case ITEM_VALUE_TYPE_FLOAT:
+							zbx_snprintf(value, MAX_STRING_LEN, ZBX_FS_DBL, item->prevvalue_dbl);
+							del_zeroes(value);
+							break;
+						case ITEM_VALUE_TYPE_UINT64:
+							zbx_snprintf(value, MAX_STRING_LEN, ZBX_FS_UI64, item->prevvalue_uint64);
+							break;
+						default:
+							zbx_snprintf(value, MAX_STRING_LEN, "%s", item->prevvalue_str);
+							break;
+					}
+					ret = SUCCEED;
+				}
 				break;
 			default:
-				zbx_snprintf(value, MAX_STRING_LEN, "%s", item->prevvalue_str);
-				break;
-			}
-			ret = SUCCEED;
+				zbx_snprintf(sql, sizeof(sql), "select value, clock from %s where itemid=" ZBX_FS_UI64 " order by %s desc",
+						table,
+						item->itemid,
+						key);
+
+				result = DBselectN(sql, num);
+
+				while (NULL != (row = DBfetch(result)))
+					if (num == ++rows)
+					{
+						zbx_snprintf(value, MAX_STRING_LEN, "%s", row[0]);
+						ret = SUCCEED;
+					}
+
+				DBfree_result(result);
 		}
-		break;
-	default:
+	} else {
 		zbx_snprintf(sql, sizeof(sql), "select value, clock from %s where itemid=" ZBX_FS_UI64 " order by %s desc",
 				table,
 				item->itemid,
@@ -688,7 +705,6 @@
 
 		DBfree_result(result);
 	}
-
 	zabbix_log(LOG_LEVEL_DEBUG, "End of evaluate_LAST()");
 
 	return ret;
@@ -1354,6 +1370,7 @@
 	int	ret  = SUCCEED;
 	struct  tm      *tm;
 	int	fuzlow, fuzhig;
+	char    last_txt[MAX_STRING_LEN], prev_txt[MAX_STRING_LEN];
 
 	zabbix_log(LOG_LEVEL_DEBUG, "In evaluate_function('%s.%s(%s)')",
 			zbx_host_key_string_by_item(item),
@@ -1479,6 +1496,22 @@
 						strcpy(value,"1");
 					}
 					break;
+                                case ITEM_VALUE_TYPE_TEXT:
+                                        if(FAIL != evaluate_LAST(last_txt, item, 1))
+                                                ret = evaluate_LAST(prev_txt, item, 2);
+
+                                        if (FAIL != ret)
+                                        {
+                                                if(strcmp(last_txt, prev_txt) == 0)
+                                                {
+                                                        strcpy(value,"0");
+                                                }
+                                                else
+                                                {
+                                                        strcpy(value,"1");
+                                                }
+                                        }
+                                        break;
 				default:
 					if(strcmp(item->lastvalue_str, item->prevvalue_str) == 0)
 					{