innerHTML属性的赋值问题

Question

function wmv()
{
var arr = showModalDialog("media.htm", "", "dialogWidth:50em; dialogHeight:25em; status:0;help:0");

if (arr != null){
var ss;
ss=arr.split("*")
var path=ss[0];
var row=ss[1];
var col=ss[2];

var string;
string="
"

var content=message.document.body.innerHTML;
content=content+string;
alert(content);
message.document.body.innerHTML=content;
alert(message.document.body.innerHTML);
}
else message.focus();
}

赋值给message.document.body.innerHTML，innerHTML 会把这部分内容丢弃