怎样向iframe中的表单传值

给iframe加contentWindow属性后,才能赋值,在IE,firefox测试一切ok.

例如：
页面a.jsp
<script language="JavaScript">
function ExecuteSql()
{
var FormObj = document.getElementById("ResultShowFrame").contentWindow;
var SqlStr=document.getElementById("sqlcontent").value;

if (SqlStr !="")
{
   FormObj.document.getElementById("Sql").value=SqlStr;
   FormObj.document.getElementById("Result").value='Submit';
   FormObj.document.ExecuteForm.submit();
}
}
</script>
<form name="dbcompress" action="?Action=CompressDate" method="post">
<textarea name="sqlcontent" rows="3" wrap="OFF" style="width:100%;" id="sqlcontent"></textarea>
<input name="Submit" type="button" onClick="ExecuteSql();" class="Anbut2"   value=" 执 行 ">
</form>

<iframe id="ResultShowFrame" scrolling="yes" src="b.asp" style="width:100%;height:420;" frameborder=1></iframe>

页面b.jsp
<form name="ExecuteForm" method="post" action="">
   <input type="hidden" name="Sql" id="Sql">
   <input type="hidden" name="Result" id="Result">
</form>