img1on = new Image();
        img1on.src ='main/b1b.png';
        img1off = new Image();
        img1off.src ='main/b1.png';
        img2on = new Image();
        img2on.src ='main/b2b.png';
        img2off = new Image();
        img2off.src ='main/b2.png';
        img3on = new Image();
        img3on.src ='main/b3b.png';
        img3off = new Image();   
        img3off.src ='main/b3.png';
        img4on = new Image();
        img4on.src ='main/b4b.png';
        img4off = new Image();   
        img4off.src ='main/b4.png';
        img5on = new Image();  
        img5on.src ='main/b5b.png';
        img5off = new Image();   
        img5off.src ='main/b5.png';
        img6on = new Image();
        img6on.src ='main/bf1b.png';
        img6off = new Image();   
        img6off.src ='main/bf1.png';
        img7on = new Image();
        img7on.src ='main/bf2b.png';
        img7off = new Image();   
        img7off.src ='main/bf2.png';
        img8on = new Image();
        img8on.src ='main/bf3b.png';
        img8off = new Image();   
        img8off.src ='main/bf3.png';
                
function imgOn(imgName) 
	{
        document[imgName].src = eval(imgName + 'on.src');
	}

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