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

		var menu1 = ms.addMenu(document.getElementById("menu1"));
		menu1.addItem("- bried instruction","main.asp"); 
		menu1.addItem("- group course","main_1.asp"); 
		menu1.addItem("- group structure","jtjg.asp");

		
		
		var menu2 = ms.addMenu(document.getElementById("menu2"));
		menu2.addItem("£­human resource","rlzy.asp");
		menu2.addItem("- technology","kjjs.asp");
		menu2.addItem("- design & develop","Desin_A_D.asp");

		var menu3 = ms.addMenu(document.getElementById("menu3"));
		menu3.addItem("- quality management","zlgl.asp");
		menu3.addItem("- checkout facility","checkout.asp");
		
		mtDropDown.renderAll();
	}