如何用JS修改DIV中文字的颜色或其它样式
这是一个简单的日历提醒，鼠标碰到那个月份，那个月份的方格的颜色就会变成白色；我还想让碰到方框里面的文字的颜色也发生改变，比如说碰到的同时，文字颜色变成了红色；下面是原程序语言，求大神能帮我解答一下应该怎么解决：
（以上部分删除)
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<script>
window.onload=function()
{
var oDiv=document.getElementById('div1');
var oBox=oDiv.getElementsByTagName('div');
var btn = null;
for(var i=0;i<oBox.length;i++)
{
oBox[i].onmouseover=function()
{
if(btn != null)
{
btn.style.backgroundColor = "";
}
btn = this;
this.style.backgroundColor = "white";
}
}
}
</script>
</head>
<body>
<div id="div1">
<div class="box" "type="button"><h1>1</h1><p>JUN</p></div>
<div class="box" "type="button"><h1>2</h1><p>FEB</p></div>
<div class="box" "type="button"><h1>3</h1><p>MAR</p></div>
<div class="box" "type="button"><h1>4</h1><p>APR</p></div>
<div class="box" "type="button"><h1>5</h1><p>MAY</p></div>
<div class="box" "type="button"><h1>6</h1><p>JUN</p></div>
<div class="box" "type="button"><h1>7</h1><p>JULY</p></div>
<div class="box" "type="button"><h1>8</h1><p>AUG</p></div>
<div class="box" "type="button"><h1>9</h1><p>SEP</p></div>
<div class="box" "type="button"><h1>10</h1><p>OCT</p></div>
<div class="box" "type="button"><h1>11</h1><p>NOV</p></div>
<div class="box" "type="button"><h1>12</h1><p>DEC</p></div>
<input class="footer" "type="text" />
</div>
</body>
</html>
window.onload=function()
{
var oDiv=document.getElementById('div1');
var oBox=oDiv.getElementsByTagName('div');
var btn = null;
for(var i=0;i<oBox.length;i++)
{
oBox[i].onmouseover=function()
{
if(btn != null)
{
btn.style.backgroundColor = "";
btn.getElementsByTagName("h1")[0].style.color = "";
}
btn = this;
this.style.backgroundColor = "white";
this.getElementsByTagName("h1")[0].style.color = "red";
}
}
}
</script>