innerhtml引用地址的问题
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>新建网页 1</title>
<script>
function intialhtmleditor(htmleditor)
{
htmleditor.document.designMode = "on";
}
function getinnertext(htmleditor1,htmleditor2,mytxtarea)
{
htmleditor1.document.body.innerHTML="<img src=\"../aa.jpg\">";
htmleditor2.document.body.innerText=htmleditor1.document.body.innerHTML;
mytxtarea.value=htmleditor1.document.body.innerHTML;
alert(htmleditor1.document.body.innerHTML);
}
</script>
</head>
<body onload="intialhtmleditor(frame1);intialhtmleditor(frame2)">
<form>
<div style=";background-color:#FF00FF">
<iframe id="frame1" style="width:500; height:300;background-color:#FF00FF" ></iframe>
<iframe id="frame2" style="width:500; height:300;background-color:#FF00FF"></iframe>
</div>
<div>
<input type="button" value="
btn1" onclick="getinnertext(frame1,frame2,txt1)">
</div>
<textarea id="txt1"></textarea>
</form>
<p><></p>
<img src="../aa.jpg">
</body>
</html>
以上的代码，我第一次在innerHTML中输入了一个相对地址，但运行后，输出innerHTML变成绝对地址，这个怎么解决，我要的效果是如果是输入的是相对地址，输出后仍是相对地址
