if (mtDropDown.isSupported()) {
		var ms = new mtDropDownSet(mtDropDown.direction.down, 0, 0, mtDropDown.reference.bottomLeft);

//第1菜单product  #号为菜单的链接地址
  		var menu1 = ms.addMenu(document.getElementById("menu1"));
  		menu1.addItem("- ATX Case","http://www.mtdistribution.com/atx.shtml"); // send no URL if nothing should happen onclick
        menu1.addItem("- Security/Surveillances","http://www.mtdistribution.com/cctv.shtml")
		menu1.addItem("- CPU","http://www.mtdistribution.com/cpu.shtml");
  		menu1.addItem("- CPU Fan","http://www.mtdistribution.com/cpu fan.shtml");
		menu1.addItem("- PC Camera","http://www.mtdistribution.com/camera.shtml");
		menu1.addItem("- CD/DVD Media","http://www.mtdistribution.com/media.shtml");
  		menu1.addItem("- DVD Player","http://www.mtdistribution.com/dvd.shtml");
		menu1.addItem("- Duplicator","http://www.mtdistribution.com/duplicator.shtml");
		menu1.addItem("- Enclosure","http://www.mtdistribution.com/enclosure.shtml");
		menu1.addItem("- Flash Disk","http://www.mtdistribution.com/flash disk.shtml");
  		menu1.addItem("- USB Card","http://www.mtdistribution.com/usb card.shtml");
  		menu1.addItem("- Keyboard","http://www.mtdistribution.com/keyboard.shtml");
		menu1.addItem("- Laptop Chargers","http://www.mtdistribution.com/chargers.shtml");
		menu1.addItem("- Laser Toner Cartridges","http://www.mtdistribution.com/toner.shtml");
  		menu1.addItem("- Modem","http://www.mtdistribution.com/modemcard.shtml");
  		menu1.addItem("- Mouse","http://www.mtdistribution.com/mouse.shtml");
		menu1.addItem("- Motherboard","http://www.mtdistribution.com/motherboard.shtml");
		menu1.addItem("- Monitor","http://www.mtdistribution.com/monitor.shtml");
		menu1.addItem("- MP3 / MP4 Players","http://www.mtdistribution.com/MP3.shtml");
  		menu1.addItem("- HUB","http://www.mtdistribution.com/hub.shtml");
		menu1.addItem("- DVD-RW / DVD-ROM","http://www.mtdistribution.com/storage.shtml");
		menu1.addItem("- Wireless TP-Link Networking","http://www.mtdistribution.com/tplink.shtml");
		menu1.addItem("- Networking","http://www.mtdistribution.com/networking.shtml");
  		menu1.addItem("- Sound Card","http://www.mtdistribution.com/soundcard.shtml");
  		menu1.addItem("- Speaker","http://www.mtdistribution.com/speaker.shtml");
		menu1.addItem("- PSU","http://www.mtdistribution.com/power.shtml");
  		menu1.addItem("- Vga","http://www.mtdistribution.com/vga.shtml");


//第2菜单Contact Us
		var menu2 = ms.addMenu(document.getElementById("menu2"));
  		menu2.addItem("- Bios Upgrade","http://www.mtdistribution.com/support-bios.shtml"); // send no URL if nothing should happen onclick
  		menu2.addItem("- Product Drivers","http://www.mtdistribution.com/support-drivers.shtml"); // send no URL if nothing should happen onclick
  		menu2.addItem("- Support Links","http://www.mtdistribution.com/support-links.shtml");
		menu2.addItem("- Traders", "http://www.mtdistribution.com/traders.shtml");
  		menu2.addItem("- Terms & Conditions","http://www.mtdistribution.com/Terms_Con.shtml");
	    menu2.addItem("- RMA","http://www.mtdistribution.com/RMA.shtml");
//第3菜单
//		var menu3 = //ms.addMenu(document.getElementById("menu3"));
//		menu3.addItem("- 手机评测", //"/testing_main.asp");
//		menu3.addItem("- 热门SP排行", "#");


		
		mtDropDown.renderAll();
	}