help!!!!

我有段让背景移动的代码。可是它只是横着移。我想让他向下移动要 怎么改

 1<script language="JavaScript">   
 2var backgroundOffset=0;   
 3var bgObject=eval('document.body');   
 4function scrollBG(maxSize){   
 5backgroundOffset=backgroundOffset+1;   
 6if(backgroundOffset>maxSize)backgroundOffset=0;   
 7bgObject.style.backgroundPosition="0"+backgroundOffset;   
 8}   
 9var ScrollTimer=window.setInterval("scrollBG(307)",64);   
10</script>

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1<script language="JavaScript">   
2var backgroundOffset=0;   
3function scrollBG(maxSize){   
4backgroundOffset=backgroundOffset+1;   
5if(backgroundOffset>maxSize)backgroundOffset=0;   
6document.body.style.backgroundPositionY="0"+backgroundOffset;   
7}   
8var ScrollTimer=window.setInterval("scrollBG(307)",64);   
9</script>
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