if (document.images) {                                                                                          

                                        
             
            img1on = new Image();                              // Aktive Bilder
            img1on.src = "images_rollover/1-on.gif";
            img2on = new Image();                                
            img2on.src = "images_rollover/2-on.gif";
            img3on = new Image();                                
            img3on.src = "images_rollover/3-on.gif";
            img4on = new Image();                                
            img4on.src = "images_rollover/4-on.gif";
            img5on = new Image();                                
            img5on.src = "images_rollover/5-on.gif";
            img6on = new Image();                                
            img6on.src = "images_rollover/6-on.gif";
            img7on = new Image();                                
            img7on.src = "images_rollover/7-on.gif";
 
            
                                                
             
            img1off = new Image();                            //Inaktive Bilder    
            img1off.src = "images_rollover/1-off.gif"; 
            img2off = new Image();                                 
            img2off.src = "images_rollover/2-off.gif"; 
            img3off = new Image();                                  
            img3off.src = "images_rollover/3-off.gif"; 
            img4off = new Image();                                 
            img4off.src = "images_rollover/4-off.gif"; 
            img5off = new Image();                                 
            img5off.src = "images_rollover/5-off.gif"; 
            img6off = new Image();                                  
            img6off.src = "images_rollover/6-off.gif"; 
            img7off = new Image();                                  
            img7off.src = "images_rollover/7-off.gif"; 


            
        }

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

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