// set up drop downs anywhere in the body of the page. I think the bottom of the page is better.. 
	// but you can experiment with effect on loadtime.
	if (mtDropDown.isSupported()) {

		//==================================================================================================
		// create a set of dropdowns
		//==================================================================================================
		// the first param should always be down, as it is here
		//
		// The second and third param are the top and left offset positions of the menus from their actuators
		// respectively. To make a menu appear a little to the left and bottom of an actuator, you could use
		// something like -5, 5
		//
		// The last parameter can be .topLeft, .bottomLeft, .topRight, or .bottomRight to inidicate the corner
		// of the actuator from which to measure the offset positions above. Here we are saying we want the 
		// menu to appear directly below the bottom left corner of the actuator
		//==================================================================================================
		var ms = new mtDropDownSet(mtDropDown.direction.down, 0, 0, mtDropDown.reference.bottomLeft);

		//==================================================================================================
		// create a dropdown menu
		//==================================================================================================
		// the first parameter should be the HTML element which will act actuator for the menu
		//==================================================================================================
		var menu1 = ms.addMenu(document.getElementById("menu1"));
		menu1.addItem(" Mensaje", "1_1.htm"); 
		menu1.addItem(" Profesores", "1_2.htm"); 
		menu1.addItem(" Administrativo", "1_3.htm");
		menu1.addItem(" Ubicación", "1_4.htm");


		// menu :
		var menu2 = ms.addMenu(document.getElementById("menu2"));
		menu2.addItem(" Perfil", "2_1.htm");
		menu2.addItem(" Plan de estudios", "2_2.htm");
		menu2.addItem(" Modalidades", "2_3.htm");
		menu2.addItem(" Intercambio", "2_4.htm");
		menu2.addItem(" Acreditaciones", "2_5.htm");
		menu2.addItem(" Proyecto CADS", "2_6.htm");
		
		
		// menu
		var menu3 = ms.addMenu(document.getElementById("menu3"));
		menu3.addItem("Sociedad de Alumnos", "3_1.htm");
		menu3.addItem("ASCE", "3_2.htm");
		menu3.addItem("ITE", "3_3.htm");
		menu3.addItem("ACI", "3_4.htm");
		
		// menu :
		var menu4 = ms.addMenu(document.getElementById("menu4"));
		menu4.addItem(" Lab. de Topografía", "4_1.htm");
		menu4.addItem(" Lab. de Materiales de Construcción", "4_2.htm");
		menu4.addItem(" Lab. de Materiales Asfálticos", "4_3.htm");
		menu4.addItem(" Lab. de Ingeniería Ambiental", "4_4.htm");
		menu4.addItem(" Lab. de Ingeniería Hidráulica", "4_5.htm");
		menu4.addItem(" Lab. de Estructuras", "4_6.htm");
		menu4.addItem(" Lab. de Mecánica de Suelos", "4_7.htm");
		menu4.addItem(" Lab. de Cómputo de IC", "4_8.htm");
	
		
				// menu
		var menu5 = ms.addMenu(document.getElementById("menu5"));
		menu5.addItem("Centros de Investigación", "5_1.htm");
		menu5.addItem("Maestría MAC", "5_2.htm");
		menu5.addItem("Cátedras", "5_3.htm");
		

		// menu
		var menu6 = ms.addMenu(document.getElementById("menu6"));
		menu6.addItem("Civiles", "6_1.htm");
		menu6.addItem("Actualización de datos", "6_2.htm");
		menu6.addItem("Revista Civiltec", "6_3.htm");
		
	

	
	
	

		//==================================================================================================
		// write drop downs into page
		//==================================================================================================
		// this method writes all the HTML for the menus into the page with document.write(). It must be
		// called within the body of the HTML page.
		//==================================================================================================
		mtDropDown.renderAll();
	}