img20on = new Image();
        img20on.src ='images/bu20b.jpg';
        img20off = new Image();
        img20off.src ='images/bu20.jpg';
        img22on = new Image();
        img22on.src ='images/bu22b.jpg';
        img22off = new Image();
        img22off.src ='images/bu22.jpg';
        
        img1on = new Image();
        img1on.src ='images/b1b.jpg';
        img1off = new Image();
        img1off.src ='images/b1.jpg';
        img2on = new Image();
        img2on.src ='images/b2b.jpg';
        img2off = new Image();
        img2off.src ='images/b2.jpg';
        img3on = new Image();
        img3on.src ='images/b3b.jpg';
        img3off = new Image();   
        img3off.src ='images/b3.jpg';
        img4on = new Image();
        img4on.src ='images/b4b.jpg';
        img4off = new Image();   
        img4off.src ='images/b4.jpg';
        img5on = new Image();  
        img5on.src ='images/b5b.jpg';
        img5off = new Image();   
        img5off.src ='images/b5.jpg';
        img6on = new Image();
        img6on.src ='images/b6b.jpg';
        img6off = new Image();   
        img6off.src ='images/b6.jpg';
        img7on = new Image();
        img7on.src ='images/b7b.jpg';
        img7off = new Image();
        img7off.src ='images/b7.jpg';
        img8on = new Image();
        img8on.src ='images/b8b.jpg';
        img8off = new Image();
        img8off.src ='images/b8.jpg';
        img9on = new Image();
        img9on.src ='images/b9b.jpg';
        img9off = new Image();
        img9off.src ='images/b9.jpg';
        img10on = new Image();
        img10on.src ='images/b10b.jpg';
        img10off = new Image();
        img10off.src ='images/b10.jpg';
        
function imgOn(imgName) 
	{
        document[imgName].src = eval(imgName + 'on.src');
	}

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