if (document.images) {            // Active Images
	img1on = new Image();      
    img1on.src = "res/nav_hdd_industry_on_04.jpg"; 
	img2on = new Image();      
    img2on.src = "res/nav_oilfield_services_on_05.jpg"; 
	img3on = new Image();      
    img3on.src = "res/nav_new_products_on_06.jpg"; 
	img4on = new Image();      
    img4on.src = "res/nav_hse_on_07.jpg"; 
	img5on = new Image();      
    img5on.src = "res/nav_about_us_on_09.jpg";
	img6on = new Image();      
    img6on.src = "res/nav_contact_us_on_10.jpg";
	img7on = new Image();      
    img7on.src = "res/index_hdd_button_on.jpg";
	img8on = new Image();      
    img8on.src = "res/oilfield_botton_on_06.gif";
	img9on = new Image();      
    img9on.src = "res/bannerlogo_01.jpg";
	img10on = new Image();      
    img10on.src = "res/4guyslink_09.gif";
	img11on = new Image();      
    img11on.src = "res/subnav_learningcenter_on_02.jpg";
	img12on = new Image();      
    img12on.src = "res/subnav_toolsandequipment_on.jpg";
	img13on = new Image();      
    img13on.src = "res/subnav_services_on_07.jpg";
	img14on = new Image();      
    img14on.src = "res/subnav_clientlist_on_09.jpg";
	img15on = new Image();      
    img15on.src = "res/subnav_bidrequest_on_04.jpg";
	img16on = new Image();      
    img16on.src = "res/subnav_get_on_04.jpg";
	img17on = new Image();      
    img17on.src = "res/subnav_gyro_mwd_on_04.jpg";
	img18on = new Image();      
    img18on.src = "res/subnav_newproducts_on_04.jpg";
	img19on = new Image();      
    img19on.src = "res/nav_careers_on_08.jpg";
	img20on = new Image();      
    img20on.src = "res/subnav_spectra_on_04.jpg";
	img21on = new Image();      
    img21on.src = "res/subnav_emtelemetry_on_04.jpg";


	
    img1off = new Image();      
    img1off.src = "res/nav_hdd_industry_04.jpg"; 
	img2off = new Image();      
    img2off.src = "res/nav_oilfield_services_05.jpg";
	img3off = new Image();      
    img3off.src = "res/nav_new_products_06.jpg";
	img4off = new Image();      
    img4off.src = "res/nav_hse_07.jpg";
	img5off = new Image();      
    img5off.src = "res/nav_about_us_09.jpg";
	img6off = new Image();      
    img6off.src = "res/nav_contact_us_10.jpg";
	img7off = new Image();      
    img7off.src = "res/index_hdd_button.jpg";
	img8off = new Image();      
    img8off.src = "res/oilfield_button_06.gif";
	img9off = new Image();      
    img9off.src = "res/bannerlogo_01.jpg";
	img10off = new Image();      
    img10off.src = "res/4guyslink_09.gif";
	img11off = new Image();      
    img11off.src = "res/subnav_learningcenter_02.jpg";
	img12off = new Image();      
    img12off.src = "res/subnav_toolsandequipment_05.jpg";
	img13off = new Image();      
    img13off.src = "res/subnav_services_07.jpg";
	img14off = new Image();      
    img14off.src = "res/subnav_clientlist_09.jpg";
	img15off = new Image();      
    img15off.src = "res/subnav_bidrequest_04.jpg";
	img16off = new Image();      
    img16off.src = "res/subnav_get_04.jpg";
	img17off = new Image();      
    img17off.src = "res/subnav_gyro_mwd_04.jpg";
	img18off = new Image();      
    img18off.src = "res/subnav_newproducts_04.jpg";
	img19off = new Image();      
    img19off.src = "res/nav_careers_08.jpg";
	img20off = new Image();      
    img20off.src = "res/subnav_spectra_04.jpg";
	img21off = new Image();      
    img21off.src = "res/subnav_emtelemetry_04.jpg";

}



// Function to 'activate' images.
function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
        }
}

// Function to 'deactivate' images.
function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}