<!--
if (document.images) {            // Active Images

            a1on = new Image();      
            a1on.src = "images_portfolio/a1_btn_on.gif";
            
            a2on = new Image();      
            a2on.src = "images_portfolio/a2_btn_on.gif";
            
            a3on = new Image();      
            a3on.src = "images_portfolio/a3_btn_on.gif";
            
            a4on = new Image();      
            a4on.src = "images_portfolio/a4_btn_on.gif";
            
            a5on = new Image();      
            a5on.src = "images_portfolio/a5_btn_on.gif";
            
            a6on = new Image();      
            a6on.src = "images_portfolio/a6_btn_on.gif";
            
            a7on = new Image();      
            a7on.src = "images_portfolio/a7_btn_on.gif";
            
            a8on = new Image();      
            a8on.src = "images_portfolio/a8_btn_on.gif";
            
            a9on = new Image();      
            a9on.src = "images_portfolio/a9_btn_on.gif";
            
            a10on = new Image();      
            a10on.src = "images_portfolio/a10_btn_on.gif";
            
          
            a1off = new Image();      
            a1off.src = "images_portfolio/a1_btn_off.gif";
            
            a2off = new Image();      
            a2off.src = "images_portfolio/a2_btn_off.gif";
            
            a3off = new Image();      
            a3off.src = "images_portfolio/a3_btn_off.gif";
            
            a4off = new Image();      
            a4off.src = "images_portfolio/a4_btn_off.gif";
            
            a5off = new Image();      
            a5off.src = "images_portfolio/a5_btn_off.gif";
            
            a6off = new Image();      
            a6off.src = "images_portfolio/a6_btn_off.gif";
            
            a7off = new Image();      
            a7off.src = "images_portfolio/a7_btn_off.gif";
            
            a8off = new Image();      
            a8off.src = "images_portfolio/a8_btn_off.gif";
            
            a9off = new Image();      
            a9off.src = "images_portfolio/a9_btn_off.gif";
            
            a10off = new Image();      
            a10off.src = "images_portfolio/a10_btn_off.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");
        }
}

// -->