UPDATE 1-Truworths posts 10 pct rise in 18-week retail sales

fall more than 2 pct (Adds details, share price) JOHANNESBURG, Nov 5 (Reuters) - South Africa's biggest clothing retailer Truworths (TRUJ.J) posted a 10 percent rise in group retail sales for the first 18-weeks of its 2010 fiscal year, and forecast tough...