Strange Page Behavior with escaped quotes

[Moebius01]

Ok, this one has me baffled. I have a page for a video rental home delivery service to allow customers to browse the movies. There's a button to allow switching between VHS and DVD (simply calls a seperate page to change a session variable and return). The code to display the button is part of a display block as follows:
<CODE>
$platsel = $_SESSION[platsel];
if ($platsel < 1) {
$_SESSION[platsel] = 1;
$platsel = 1;
}
if ($platsel == 1) { $platname = &quot;DVD&quot;; $otherplat = &quot;Switch To VHS&quot;; }
if ($platsel == 2) { $platname = &quot;VHS&quot;; $otherplat = &quot;Switch To DVD&quot;; }


$header_block .=&quot; <td align=\&quot;center\&quot;><div style=\&quot;PADDING-RIGHT: 5px; PADDING-LEFT: 5px; PADDING-BOTTOM: 5px; PADDING-TOP: 0px\&quot;><font color=990000><input type=\&quot;button\&quot; value=\&quot;$otherplat\&quot; onClick=window.location=\&quot;demoswitchplat.php\&quot;></div></td>\n&quot;;
</CODE>

As far as I can tell, all seems happy there. However, the first time the page is called I see a syntax error, and upon looking at the source output to the browser, I see this:

<td align=&quot;center&quot;><div style=&quot;PADDING-RIGHT: 5px; PADDING-LEFT: 5px; PADDING-BOTTOM: 5px; PADDING-TOP: 0px&quot;><font color=990000><input type=&quot;button&quot; value=&quot;Switch To VHS&quot; onClick=&quot;window.location=&quot;&quot;demoswitchplat.php&quot;></div></td>

Note the way the quotes around the onClick are messed up. Refreshing the page fixes the problem:

<td align=&quot;center&quot;><div style=&quot;PADDING-RIGHT: 5px; PADDING-LEFT: 5px; PADDING-BOTTOM: 5px; PADDING-TOP: 0px&quot;><font color=990000><input type=&quot;button&quot; value=&quot;Switch To VHS&quot; onClick=window.location=&quot;demoswitchplat.php&quot;></div></td>

I'm assuming this has something to do with the session, but I can't for the life of me figure out why it doesn't work the first time when there is no session variable yet.

 

[sleipnir214]

Unfortunately, the script code you've shown has nothing whatsoever to do with outputting quotes. This makes it difficult to advise you.

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[Moebius01]

That's pretty much the bulk of the code for the button. The first chunk determines the current selection and creates the variables, the second part puts them into the HTML block. The quotes that I'm referring to are the escaped quotes in the $header_block statement. The kicker is in the output to browser on the first round. It places quotes where I didn't put them. On a refresh it works fine. Note the odd quote placement when the source is viewed.

onClick=&quot;window.location=&quot;&quot;demoswitchplat.php&quot;

The code is written to output it as

onClick=window.location=&quot;demoswitchplat.php&quot;

which it does properly on a refresh.