var img_bt_01 = new Image();
var img_bt_01 = new Image();
var img_bt_02 = new Image();
var img_bt_03 = new Image();
var img_bt_04 = new Image();
var img_bt_05 = new Image();
var img_bt_06 = new Image();
var img_bt_07 = new Image();
var img_bt_08 = new Image();
img_bt_01.src="images/nav/bt_01.gif";
img_bt_02.src="images/nav/bt_02.gif";
img_bt_03.src="images/nav/bt_03.gif";
img_bt_04.src="images/nav/bt_04.gif";
img_bt_05.src="images/nav/bt_05.gif";
img_bt_06.src="images/nav/bt_06.gif";
img_bt_07.src="images/nav/bt_07.gif";
img_bt_08.src="images/nav/bt_08.gif";

var theHTML = ''+
'<table width="100%" border="0" cellspacing="0" cellpadding="0">'+
'  <tr>'+
'    <td><img src="images/head_red_05.gif" width="23" height="25" /></td>'+
'    <td><a href="index.html"><img id="bt_01" src="images/nav/bt_01.gif" width="66" height="25" border="0" onmouseover="overMe(this)" onmouseout="outMe(this)" onclick="clickMe(this)"/></a></td>'+
'    <td><a href="news.html"><img id="bt_02" src="images/nav/bt_02.gif" width="68" height="25" border="0" onmouseover="overMe(this)" onmouseout="outMe(this)" onclick="clickMe(this)"/></a></td>'+
'    <td><a href="practice.html"><img id="bt_03" src="images/nav/bt_03.gif" width="68" height="25" border="0" onmouseover="overMe(this)" onmouseout="outMe(this)" onclick="clickMe(this)"/></a></td>'+
'    <td><a href="teach.html"><img id="bt_04" src="images/nav/bt_04.gif" width="80" height="25" border="0" onmouseover="overMe(this)" onmouseout="outMe(this)" onclick="clickMe(this)"/></a></td>'+
'    <td><a href="students.html"><img id="bt_05" src="images/nav/bt_05.gif" width="68" height="25" border="0" onmouseover="overMe(this)" onmouseout="outMe(this)" onclick="clickMe(this)"/></a></td>'+
'    <td><a href="teacher.html"><img id="bt_06" src="images/nav/bt_06.gif" width="68" height="25" border="0" onmouseover="overMe(this)" onmouseout="outMe(this)" onclick="clickMe(this)"/></a></td>'+
'    <td><a href="memo.html"><img id="bt_07" src="images/nav/bt_07.gif" width="80" height="25" border="0" onmouseover="overMe(this)" onmouseout="outMe(this)" onclick="clickMe(this)"/></a></td>'+
'    <td><a href="link.html"><img id="bt_08" src="images/nav/bt_08.gif" width="66" height="25" border="0" onmouseover="overMe(this)" onmouseout="outMe(this)" onclick="clickMe(this)"/></a></td>'+
'    <td><img src="images/head_red_06.gif" width="78" height="25" /></td>'+
'  </tr>'+
'</table>';
function writeNav(){
	document.write(theHTML);
}
function overMe(o){
	o.src="images/nav/"+o.id+"a.gif";
}
function outMe(o){
	o.src="images/nav/"+o.id+".gif";
}
function clickMe(o){
	return;
}