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function aa()
{
var a="image/map5.jpg"
return a

}
</script>

<table border="1" width="1000" > 
<tr >
<td width="800" background="aa" height="600" onDblClick="">
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<script language="javascript">
function aa(td)
{
var a="image/map5.jpg"
td.style.background = "#fff url(" + a + ") no-repeat";
}
</script>

<table border="1" width="1000" >  
<tr >
<td width="800" height="600" onDblClick="aa(this);">
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