อยากทราบเรื่องการ refresh iframe โดยการกดปุ่ม button

<input type="button" name="btnRefresh" value="Refresh" OnClick="javascript:document.frames['iframe_price'].location.reload();">

<script language="JavaScript">

function refreshgrid()
{
document.frames['iframe_price'].location.href="price.aspx";	
document.frames['iframe_customer'].location.href="Customer.aspx";	
document.frames['iframe_trade'].location.href="TradeOrder.aspx";	
document.frames['iframe_account'].location.href="Account.aspx";	
document.frames['iframe_summary'].location.href="SummaryAccount.aspx";
document.frames['iframe_openposition'].location.href="OpenPosition.aspx";
}
</script>

document.frames['iframe_openposition'].location.href="OpenPosition.aspx";