<!-- µð½ºÇÃ·¹ÀÌ¸Þ´º ½ºÅ©¸³Æ® -->
         function DisplayMenu(index) {
         for (i=1; i<=3; i++)
         if (index == i) {
         thisMenu = eval("menu" + index + ".style");
         thisMenu.display = "";
         } 
         else {
         otherMenu = eval("menu" + i + ".style"); 
         otherMenu.display = "none"; 
         }
         }
