如何实现点击表格的一行就改变这一行的背景色，点击另一行时又改变另一行的背景色，同时使这一行的背景色又恢复原来的颜色？？？

看看下面的例子：
<HTML>
<HEAD>
<META content="text/html; charset=gb2312" http-equiv=Content-Type>
<STYLE type=text/css>BODY {
BACKGROUND: white; COLOR: black; FONT-FAMILY: verdana,arial,helvetica; FONT-SIZE: 12px
}
.tableData {
BACKGROUND: white; BORDER-BOTTOM: white 1px dashed; BORDER-LEFT: white 1px dashed; BORDER-RIGHT: white 1px dashed; BORDER-TOP: white 1px dashed; COLOR: black; CURSOR: hand; FONT-FAMILY: verdana,arial,helvetica; FONT-SIZE: 12px
}
.tableDataSel {
BACKGROUND: #6090d0; BORDER-BOTTOM: #6090d0 1px dashed; BORDER-LEFT: #6090d0 1px dashed; BORDER-RIGHT: #6090d0 1px dashed; BORDER-TOP: #6090d0 1px dashed; COLOR: white; CURSOR: hand; FONT-FAMILY: verdana,arial,helvetica; FONT-SIZE: 12px
}
.tableDataHit {
BACKGROUND: #d0e0ff; BORDER-BOTTOM: #d0e0ff 1px dashed; BORDER-LEFT: #d0e0ff 1px dashed; BORDER-RIGHT: #d0e0ff 1px dashed; BORDER-TOP: #d0e0ff 1px dashed; COLOR: black; CURSOR: hand; FONT-FAMILY: verdana,arial,helvetica; FONT-SIZE: 12px
}
.tableDataOver {
BACKGROUND: #d0e0ff; BORDER-BOTTOM: #d0e0ff 1px dashed; BORDER-LEFT: #d0e0ff 1px dashed; BORDER-RIGHT: #d0e0ff 1px dashed; BORDER-TOP: #d0e0ff 1px dashed; COLOR: black; CURSOR: hand; FONT-FAMILY: verdana,arial,helvetica; FONT-SIZE: 12px
}
.controlPanel {
BACKGROUND: silver; COLOR: black; CURSOR: hand; FONT-FAMILY: verdana,arial,helvetica; FONT-SIZE: 14px
}
.controlPanelMouseOver {
BACKGROUND: #d0e0ff; COLOR: black; CURSOR: hand; FONT-FAMILY: verdana,arial,helvetica; FONT-SIZE: 14px
}
.delMouseOver {
BACKGROUND: #d0e0ff; COLOR: black; CURSOR: hand; FONT-FAMILY: verdana,arial,helvetica; FONT-SIZE: 14px
}
.scheduleButtonVisible {
BACKGROUND: silver; BORDER-BOTTOM: gray 1px dashed; BORDER-LEFT: white 1px dashed; BORDER-RIGHT: gray 1px dashed; BORDER-TOP: white 1px dashed; COLOR: black; CURSOR: hand; FONT-FAMILY: webdings; FONT-SIZE: 12px
}
</STYLE>
<SCRIPT language=javascript>
var modified=0
var currentLine=-1//该变量似乎保存"ln"属性；lightOn函数中line记录实际行数
var line=-1;
function lightOn(ln)
{
if (ln==null)
  ln=parseInt(event.srcElement.ln,10)
for (i=1;i<PLList.rows.length;i++)
  if (tdt[i].ln==ln)
   line=i
cln=currentLine
oldLine=-1
for (i=1;i<PLList.rows.length;i++)
  if (tdt[i].ln==cln)
   oldLine=i
if (line==oldLine)
  return
//if td <0 then only clear all title
if (line>0)
{
  document.all.tdt[line].className="tableDataHit";
  document.ecform("date")[line].className="tableDataHit";
  document.ecform("diagnosis")[line].className="tableDataHit";
  document.ecform("medication")[line].className="tableDataHit";
  if (oldLine>0)
  {
   document.all.tdt[oldLine].className="tableData";
   document.ecform("date")[oldLine].className="tableData";
   document.ecform("diagnosis")[oldLine].className="tableData";
   document.ecform("medication")[oldLine].className="tableData";
  }
  currentLine=ln
}
}
function delIt()
{
line=parseInt(event.srcElement.ln,10)

if (line>0)
  for (i=1;i<PLList.rows.length;i++)
   if (tdt[i].ln==line)
   {
    if (document.ecform.diagnosis[i].value.length>0 || document.ecform.medication[i].value.length>0 || document.ecform.date[i].value.length>0)
     if (!confirm("Are you sure you want to delete this record?"))
      return
    PLList.deleteRow(i)
   }
}
function modifiedIt(field)
{
// field.value=checkText(field.value);
modified=1
line=parseInt(event.srcElement.ln,10)

if (line>0)
   for (i=1;i<PLList.rows.length;i++)
    if (tdt[i].ln==line)
     document.ecform.edit[i].value=1
}
function newHospitalVisit()
{
newRow=PLList.insertRow(PLList.rows.length);
newRow.id="tdt";
newRow.ln=allCount;
newRow.bgColor="#e0e0e0";
newRow.className="tableData";
newRow.onclick=lightOn;c1=newRow.insertCell(0);
c1.id="delItem";
c1.ln=allCount;
c1.className="scheduleButtonVisible";
c1.onclick=delIt;
c1.onmouseover=mouseOver;
  c1.onmouseout=mouseOut;
c1.innerHTML="<input type=hidden name=PLID value=0><input type='hidden' name='edit' value=0>";
c2=newRow.insertCell(1);
c2.ln=allCount;
c2.innerHTML="<input type=text size=10 maxlength=10 name=date ln="+allCount+" class=tableData onkeyup='modifiedIt()'>"
c3=newRow.insertCell(2);
c3.ln=allCount;
c3.innerHTML="<input type=text size=25 maxlength=50 name=diagnosis ln="+allCount+" class=tableData onkeyup='modifiedIt()'>"
c4=newRow.insertCell(3);
c4.ln=allCount;
c4.innerHTML="<input type=text size=58 maxlength=100 name=medication ln="+allCount+" class=tableData onkeyup='modifiedIt()'>"
allCount++
}
function mouseOver()
{
event.srcElement.className="delMouseOver"
}
function mouseOut()
{
event.srcElement.className="scheduleButtonVisible"
}
</SCRIPT>
  <META content="Microsoft FrontPage 4.0" name=GENERATOR>
</HEAD>
<BODY bgColor=white>
<FORM method=post name=ecform>
  <FONT size=2>
          <INPUT name=edit type=hidden value=0><INPUT name=PLID type=hidden
      value=56 ln="3"><INPUT name=edit type=hidden value=0><INPUT name=PLID type=hidden
      value=55 ln="2"><INPUT name=edit type=hidden value=0><INPUT name=PLID type=hidden
      value=54 ln="1"></FONT><FONT color=white><INPUT
      name=edit type=hidden><INPUT name=PLID type=hidden>
  </FONT>
  <DIV id=div1
style="left: 0; position: absolute; top: 0; visibility: visible; width: 658; height: 151">
    <TABLE bgColor=silver border=2 borderColorDark=gray borderColorLight=silver
cellPadding=2 cellSpacing=1 cols=1 id=PLList rules=rows width="100%">
      <TBODY>
      <TR bgColor=#0a6846 id=tdt>
        <TH width="10%">
          <INPUT name=date type=hidden>
          <FONT color=white>Date </FONT>
        <TH width="30%">
          <INPUT name=diagnosis type=hidden>
          <FONT
      color=white>Diagnosis </FONT>
        <TH width="60%">
          <INPUT name=medication type=hidden>
          <FONT
      color=white>Medication </font>
      </TR>
      <TR bgColor=#e0e0e0 class=tableData id=tdt onclick=lightOn() ln="1">
        <TD ln="1">
          <INPUT class=tableData maxLength=10 name=date
      onkeyup=modifiedIt(this) size=10 ln="1">
        </TD>
        <TD ln="1">
          <INPUT class=tableData maxLength=50 name=diagnosis
      onkeyup=modifiedIt(this) size=25 value="what do you think of it?"
    ln="1">
        </TD>
        <TD ln="1">
          <INPUT class=tableData maxLength=100 name=medication
      onkeyup=modifiedIt(this) size=58 value="like it?" ln="1">
        </TD>
      </TR>
      <TR bgColor=#e0e0e0 class=tableData id=tdt onclick=lightOn() ln="2">
        <TD ln="2">
          <INPUT class=tableData maxLength=10 name=date
      onkeyup=modifiedIt(this) size=10 value=01/01/1999 ln="2">
        </TD>
        <TD ln="2">
          <INPUT class=tableData maxLength=50 name=diagnosis
      onkeyup=modifiedIt(this) size=25 value="it`s a test" ln="2">
        </TD>
        <TD ln="2">
          <INPUT class=tableData maxLength=100 name=medication
      onkeyup=modifiedIt(this) size=58 value="how about it?" ln="2">
        </TD>
      </TR>
      <TR bgColor=#e0e0e0 class=tableData id=tdt onclick=lightOn() ln="3">
        <TD ln="3">
          <INPUT class=tableData maxLength=10 name=date
      onkeyup=modifiedIt(this) size=10 value=02/01/2000 ln="3">
        </TD>
        <TD ln="3">
          <INPUT class=tableData maxLength=50 name=diagnosis
      onkeyup=modifiedIt(this) size=25 value="another test" ln="3">
        </TD>
        <TD ln="3">
          <INPUT class=tableData maxLength=100 name=medication
      onkeyup=modifiedIt(this) size=58 ln="3">
        </TD>
      </TR>
      </TBODY>
    </TABLE>
    <SCRIPT>
allCount=4
</SCRIPT>
  </DIV>
</FORM>
</BODY>
</HTML>

解决方案 »

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<table width="758" border="0" cellspacing="0" cellpadding="0" id=mxh>
<tr onclick="Mover(this)">
<td>带颜色渐变的鼠标文字跟随</td>
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<td>带颜色渐变的鼠标文字跟随</td>
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<td>带颜色渐变的鼠标文字跟随</td>
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<tr onclick="Mover(this)" bgcolor="#0099FF">
<td>带颜色渐变的鼠标文字跟随</td>
</tr>
<tr onclick="Mover(this)" bgcolor="#0099FF">
<td>带颜色渐变的鼠标文字跟随</td>
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