if (document.images) {
	
	missionon = new Image();           // Active images
	missionon.src = "images/mission1.gif";
	missionoff = new Image();          // Inactive images
	missionoff.src = "images/mission2.gif";

	tulsaon = new Image();           // Active images
	tulsaon.src = "images/tulsa1.gif";
	tulsaoff = new Image();          // Inactive images
	tulsaoff.src = "images/tulsa2.gif";
	
	alson = new Image();           // Active images
	alson.src = "images/als1.gif";
	alsoff = new Image();          // Inactive images
	alsoff.src = "images/als2.gif";
	
	historyon = new Image();           // Active images
	historyon.src = "images/history1.gif";
	historyoff = new Image();          // Inactive images
	historyoff.src = "images/history2.gif";
	
	annualreporton = new Image();           // Active images
	annualreporton.src = "images/annualreport1.gif";
	annualreportoff = new Image();          // Inactive images
	annualreportoff.src = "images/annualreport2.gif";
	
	annualreport2on = new Image();           // Active images
	annualreport2on.src = "images/annualreport3.gif";
	annualreport2off = new Image();          // Inactive images
	annualreport2off.src = "images/annualreport4.gif";
	
	contactson = new Image();           // Active images
	contactson.src = "images/contacts1.gif";
	contactsoff = new Image();          // Inactive images
	contactsoff.src = "images/contacts2.gif";
	
	
  }
    function imgOn(imgName) {
            if (document.images) {
                document[imgName].src = eval(imgName + "off.src");
            }
    }
    function imgOff(imgName) {
            if (document.images) {
                document[imgName].src = eval(imgName + "on.src");        
            }
    }