Preview button for a News Manager

 

I created a News manager with ASP
in Post News Page I have 2 button first one "Publish" and second is "Preview News" like this forum,

the problem,

I have a page with this name "dostuff.asp" this page is for posting news ,
I am using this javascript code for previewing News in a popup window
the page for previewing news is a section of dostuff.asp

<script language="JavaScript">

function preview()
{

window.open('dostuff.asp','previewWin','scrollbars=yes,resizable=yes,width=650,height=500');

document.postnews.action.value = 'preview';

document.postnews.target='previewWin';

document.postnews.submit();

}

</script>

when I click on Preview button every thing is ok and it will show me the preview of News ,
But when I close the preview window and  click on publish button it will open preview window again,

Its something like a history for javascript after clicking on preview button it will store file address in somewhere and after I click on the publish it will open stored address of file

what is the solution for this problem?

 

 

Thanks

Object doesn't support this property or method

 

==

the line 150 line 150 is this

<input type="button" value="Preview" name="B3" onclick="publish()">

where I call the function