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img1.src= "images/But1_off.gif";
img2= new Image();
img2.src= "images/But2_off.gif";
img3= new Image();
img3.src= "images/But3_off.gif";
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img4.src= "images/But4_off.gif";
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img5.src= "images/But5_off.gif";
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img6.src= "images/But6_off.gif";
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img10= new Image();
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img10on= new Image();
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