你传的知识个字符串呀
function show(T_id,bkColor,Tborder,color){
T_id=document.getElementById(T_id); //这样就好了
this.T_id = T_id
T_id.style.backgroundColor="'"+bkColor+"'";
T_id.style.border="1px solid '"+Tborder+"'";
T_id.style.color="'"+color+"'";
}
function show(T_id,bkColor,Tborder,color){
T_id=document.getElementById(T_id); //这样就好了
this.T_id = T_id
T_id.style.backgroundColor="'"+bkColor+"'";
T_id.style.border="1px solid '"+Tborder+"'";
T_id.style.color="'"+color+"'";
}
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<BODY>
<SCRIPT LANGUAGE="JavaScript">
<!--
function show(T_id,bkColor,Tborder,color){
var t_id = document.getElementById(T_id);
t_id.style.backgroundColor =bkColor;
t_id.style.border="1px solid "+Tborder;
t_id.style.color=color;
}
//-->
</SCRIPT><table width="75%" border="0">
<tr onMouseOver="return show('id15','#eaf3fa','#78b1e2','#205f96');">
<td><div align="right" class="style6"><strong>ÕæʵÐÕÃû <span class="style4">*</span>
</strong></div></td>
<td><input type="text" name="usertruename" size="15"></td>
<td class="td" id="id15" style="background-color: #ffffff;border:1px solid #FFffff;">ÇëÎñ±ØÌîдÕæʵµÄÐÕÃû</td>
</tr>
</table></BODY>
</HTML>
<!--
function show(T_id,bkColor,Tborder,color){
obj = document.getElementById(T_id);
obj.style.backgroundColor=bkColor;
obj.style.border="1px solid "+Tborder+"";
obj.style.color=color;
}
//-->
</SCRIPT>
<table width="75%" border="0">
<tr onClick="show('id15','#eaf3fa','#78b1e2','#205f96');">
<td><div align="right" class="style6"><strong>真实姓名 <span class="style4">*</span>
</strong></div></td>
<td><input type="text" name="usertruename" size="15"></td>
<td class="td" id="id15" style="background-color: #ffffff;border:1px solid #FFffff;">请务必填写真实的姓名</td>
</tr>
</table>