js改变background的问题，用的是aa.style.background="url(2.jpg)";总是有错，请求高人指点，代码如下
<!DOCTYPE html><html><head><script> function fun(){ // var Arr=new Array( "1.jpg ", "2.jpg ") // var i=0 ; var aa=document.getElementById("aa"); aa.style.background="url(2.jpg)"; alert("sdfsdfsdf"); }</script> </head><body><table width=500 height=100 id= "aa " background="1.jpg" > <tr> <td> aaaa </td> </tr> </table> <input type="submit" value="Button" id="bb" onClick="fun();"/></body></html>
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