how to open aspx page inside of a table cell using javascript

In my Project I have a table on which I use a cell in order to open various pages with different works.
I use that script:

Dim url As String = "../../Pages/Support/Asp/Help01.aspx"

Dim msg As String = "<script type='text/javascript'> 
document.getElementById('iFrame').innerHTML = " +
"$(document).ready(function(){  window.location.href='" + url + "';  }); 
</script>"

Page.ClientScript.RegisterStartupScript(Me.GetType(), "myURL", msg)

For this purpose. But what I get is to close the current page and open (in full screen) the new page.
How can I make the new page to open inside of the table cell which I want.

Copyright Notice：Content Author:「Lefteris Gkinis」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/21202631/how-to-open-aspx-page-inside-of-a-table-cell-using-javascript