function urlFilter(url) {
		if (hcp != "") {
			var baseUrl = (url.indexOf("?") != -1 ? url.substr(0, url.indexOf("?")) : url);
			var queryString = (url.indexOf("?") != -1 ? url.substr(url.indexOf("?")+1) : "");
			return (contextPath + baseUrl + "?hcp=" + hcp + (queryString != "" ? "&" + queryString : ""));
		}
		else return (contextPath + url);
	}
	
	function openwindow() {
    window.open('images/Photo Album/photo1.html','gallery',' menubar=no toolbar=no scrollbars=yes left=650, top=70, width=540 height=620');
	}
		
	// set up drop downs 
	if (ncqDropDown.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 ncqDropDownSet(ncqDropDown.direction.down, 9, 4, ncqDropDown.reference.bottomLeft);
		
		//==================================================================================================
		// create a dropdown menu
		//==================================================================================================
		// the first parameter should be the HTML element which will act actuator for the menu
		// send no URL if nothing should happen onclick (2nd parameter)
		//==================================================================================================

		/*************
		 * Dredging
		 *************/
	
		/*************
		 * Waterway Maintenance
		 *************/
		//var menu3 = ms.addMenu(document.getElementById("menu3"));
		//menu3.addItem("Spare Parts", urlFilter("#"));
		//menu3.addItem("Logistics", urlFilter("#"));
		//menu3.addItem("Capabilities/Qualifications", urlFilter("#"));
		//menu3.addItem("Our Facilities", urlFilter("#"));
		//menu3.addItem("Employment Opportunities", urlFilter("#"));
		
		/*************
		 * Waterway Maintenance
		 *************/
		var menu4 = ms.addMenu(document.getElementById("menu4"));
		menu4.addItem("Main Info", urlFilter("engineering.html"));
		menu4.addItem("Spare Parts", urlFilter("spareparts.html"));
		//menu4.addItem("Logistics", urlFilter("logistics.html"));
		menu4.addItem("Capabilities/Qualifications", urlFilter("capabilities.html"));
		menu4.addItem("Our Facilities", urlFilter("facilities.html"));
		//menu4.addItem("Meet the Team", urlFilter("team.html"));
		menu4.addItem("Employment Opportunities", urlFilter("employment.html"));
		//==================================================================================================
		// 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.
		//==================================================================================================
		ncqDropDown.renderAll();
	}