if (document.images) {            // Active Images
	img1on = new Image();      
    img1on.src = "res/analytical_services_on.gif"; 
	img2on = new Image();      
    img2on.src = "res/database_products_on.gif"; 
	img3on = new Image();      
    img3on.src = "res/studies_on.gif"; 
	img4on = new Image();      
    img4on.src = "res/schools_training_on.gif"; 
	img5on = new Image();      
    img5on.src = "res/contact_us_on.gif"; 
	img6on = new Image();      
    img6on.src = "res/prodanalytical_services_on.gif"; 
	img7on = new Image();      
    img7on.src = "res/proddatabase_products_on.gif"; 
	img8on = new Image();      
    img8on.src = "res/prodstudies_on.gif"; 
	img9on = new Image();      
    img9on.src = "res/prodschools_training_on.gif"; 
	img10on = new Image();      
    img10on.src = "res/prodcontact_us_on.gif"; 
	
  
    img1off = new Image();      
    img1off.src = "res/analytical_services.gif"; 
	img2off = new Image();      
    img2off.src = "res/database_products.gif"; 
	img3off = new Image();      
    img3off.src = "res/studies.gif"; 
	img4off = new Image();      
    img4off.src = "res/schools_training.gif"; 
	img5off = new Image();      
    img5off.src = "res/contact_us.gif"; 
	img6off = new Image();      
    img6off.src = "res/prodanalytical_services.gif"; 
	img7off = new Image();      
    img7off.src = "res/proddatabase_products.gif"; 
	img8off = new Image();      
    img8off.src = "res/prodstudies.gif"; 
	img9off = new Image();      
    img9off.src = "res/prodschools_training.gif"; 
	img10off = new Image();      
    img10off.src = "res/prodcontact_us.gif"; 

	
}



// 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");
        }
}

// Function for image swap.
function imgSwapX(strTarget, imgName) {
	document[strTarget].src = imgName;
}