<script type="text/javascript">  function jumpPage() {     if (event.keyCode==37)//左 fun_a(); if (event.keyCode==38)//上  fun_b();  if (event.keyCode==39)//右 fun_c(); if (event.keyCode==40)//下 fun_d();  }   function fun_a(){ window.alert('你按下了左')  } function fun_b(){ window.alert('你按下了上') } function fun_c(){ window.alert('你按下了右') } function fun_d(){  window.alert('你按下了下') } document.onkeydown=jumpPage; </script>

<table width="100%" border="1" cellspacing="1" cellpadding="0" id=table> <tr id="lineone" style="background-color:#00cccc;"> <td id=aa height="23"> </td> <td id=aa >按向下键</td> <td id=cc >按向下键</td> <td id=dd >按向下键</td> <td id=ee >按向下键</td> </tr> <tr id="linetwo" tyle="background-color:#ffffff;"> <td id=a height="23"> </td> <td id=b >按向上键</td> <td id=c >按向上键</td> <td id=d >按向上键</td> <td id=e >按向上键</td> </tr></table><script language="javascript"> function keyDown(e) { var iekey=event.keyCode; action(iekey); } document.onkeydown = keyDown; function action(iekey) { if(iekey==40) { lineone.style.backgroundColor = ""; linetwo.style.backgroundColor = "#00cccc"; } if(iekey==38) { lineone.style.backgroundColor = "#00cccc"; linetwo.style.backgroundColor = ""; } } </script><input name="id" type="hidden" id="id" value