Print a generated document

I'm trying to allow the viewer to print/preview only the article that I generate for the web site. For the life of me, I can't get it to work. What am I doing wrong?
***********************************************************************
//This is my php file
<tr>
<td width="575" valign="top" rowspan="8">
<!--Begin article listing for category-->
<div id="mainbody">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<?php
$articleText = new GetRecord(); //instantiate the object
$articleText -> get_ArticleText(); //call the function to get the actual article
?>

<tr><td>
<?php
print("</td><p align='left' style='padding: 0 30px' class='MsoNormal' style='MARGIN: 0in 0in 0pt'><input type='button' onClick='fullwin($prtArticleText)' value='Print Article'></p></tr>\n");
?>
</td></tr>
</table> <!--End of Article Listing-->
</div>
</td>
</tr>

*********************************************************************
//This is my javascript
function fullwin(sPrtText) {
var aWindow = window.open("","Article","fullscreen,scrollbars");

aWindow.document.write(sPrtText);

}

**********************************************************************
//This is from my class. The $prtArticleText is public.
function get_ArticleText()
{
$artnum=($_GET["artnum"]);

mysql_connect("localhost", "root", "") or
die("Could not connect: " . mysql_error());
mysql_select_db("test");


$result = mysql_query("SELECT article_title, article_subtitle, article_author, article_imagepath, article_videopath, article_text FROM article WHERE (article_id = '$artnum')") or die("Couldn't get data from ARTICLE table: ".mysql_error());
print("<tr><td>\n");
$prtArticleText = "<tr><td>\n";

while ( $row = mysql_fetch_object($result) )
{
$myarttitle = $row->article_title;
$myartsubtitle = $row->article_subtitle;
$myartauthor = $row->article_author;
$myartimage = $row->article_imagepath;
$myartvideo = $row->article_videopath;
$myarttext = $row->article_text;

print("<tr><td><center><h1>$myarttitle</h1></center></td></tr>\n");
$prtArticleText = $prtArticleText + "<tr><td><center><h1>$myarttitle</h1></center></td></tr>\n";

if (strlen($myartsubtitle)> 0)
{
print("<tr><td><center><h2>$myartsubtitle</h></center><br></td></tr>\n");
$prtArticleText = $prtArticleText + "<tr><td><center><h2>$myartsubtitle</h></center><br></td></tr>\n";
}
if (strlen($myartauthor)> 0)
{
print("<tr><td><center><i>by $myartauthor</i></center></td></tr>\n");
$prtArticleText = $prtArticleText + "<tr><td><center><i>by $myartauthor</i></center></td></tr>\n";
}
print("<tr><td height='2' valign='top' bgcolor='#990000' align='left' width='100%' nowrap='nowrap'></td></tr>\n");
if (strlen($myartimage)> 0)
{
print("<tr><td>&nbsp;<br><img src='$myartimage' alt='article image' border='0' vspace='5' hspace='10' align='left'><p>$myarttext</p></td></tr>\n");
$prtArticleText = $prtArticleText + "<tr><td>&nbsp;<br><img src='$myartimage' alt='article image' border='0' vspace='5' hspace='10' align='left'><p>$myarttext</p></td></tr>\n";
}
else
{
print("<tr><td>$myarttext</td></tr>\n");
$prtArticleText = $prtArticleText + "<tr><td>$myarttext</td></tr>\n";
}
}



$artlabel = $myarttitle;
/*$arturl = '<a href="http://127.0.0.1/articletext.php?artnum=' .$artnum. '">' .$artlabel. '</a>'; */
$arturl = '<a href="/articletext.php?artnum=' .$artnum. '">' .$artlabel. '</a>';

$trail = new Breadcrumb();
$trail->addBreadcrumb($artlabel,$arturl,2);
// Now output the navigation
/*if (basename($_SERVER['SCRIPT_NAME']) !== index.php){ $trail->output();} */
$trail->output();

return $result;


mysql_close("test");
}