<table border="1">
<tr onmousedown="ff(this)">
<td>aaaaa</td>
</tr>
<tr onmousedown="ff(this)">
<td>aaaaa</td>
</tr>
<tr onmousedown="ff(this)">
<td>aaaaa</td>
</tr>
<tr onmousedown="ff(this)">
<td>aaaaa</td>
</tr>
<tr onmousedown="ff(this)">
<td>aaaaa</td>
</tr>
</table><script>
var pobj=null;
function ff(obj) {
if(pobj!=null)pobj.runtimeStyle.backgroundColor = "";
if(pobj=obj)pobj.runtimeStyle.backgroundColor = "red";
}
</script>
<tr onmousedown="ff(this)">
<td>aaaaa</td>
</tr>
<tr onmousedown="ff(this)">
<td>aaaaa</td>
</tr>
<tr onmousedown="ff(this)">
<td>aaaaa</td>
</tr>
<tr onmousedown="ff(this)">
<td>aaaaa</td>
</tr>
<tr onmousedown="ff(this)">
<td>aaaaa</td>
</tr>
</table><script>
var pobj=null;
function ff(obj) {
if(pobj!=null)pobj.runtimeStyle.backgroundColor = "";
if(pobj=obj)pobj.runtimeStyle.backgroundColor = "red";
}
</script>
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