The dollar index rose to its highest in 1-1/2 months on Friday, helped by the U.S. currency gains against the euro as fresh worries about Greece weighed on the single currency. The index rose to 80.27, up 0.25 percent on the day, as the euro dropped to a two-week low of $1.28825 on trading platform EBS after stop-loss sell orders were triggered below $1.2900. The euro also lost 1 percent against the yen, dropping to a 10-day low of 102.725 yen (full story)