JavaScript - Execute Php Page From Javascript

First off; i was in two minds if this belonged in the .php forum or the javascript forum; i apologize if i chose the wrong one.

I have this .php code:
PHP Code:
<?php 
        $query = "SELECT mail_id FROM ".TBL_MAIL." WHERE UserTo = '$session->username' and status = 'unread'";
        $numUnreadMail = $database->query($query) or die(mysql_error());
        $numUnreadMail = mysql_num_rows($numUnreadMail);

        if($numUnreadMail == 0){ echo '<img src="../images/global/mail_imgs/inbox_0.png" width="22" height="15" />';}
        if($numUnreadMail == 1){ echo '<img src="../images/global/mail_imgs/inbox_1.png" width="22" height="15" />';}
        if($numUnreadMail == 2){ echo '<img src="../images/global/mail_imgs/inbox_2.png" width="22" height="15" />';}
        if($numUnreadMail == 3){ echo '<img src="../images/global/mail_imgs/inbox_3.png" width="22" height="15" />';}
        if($numUnreadMail == 4){ echo '<img src="../images/global/mail_imgs/inbox_4.png" width="22" height="15" />';}
        if($numUnreadMail == 5){ echo '<img src="../images/global/mail_imgs/inbox_5.png" width="22" height="15" />';}
        if($numUnreadMail == 6){ echo '<img src="../images/global/mail_imgs/inbox_6.png" width="22" height="15" />';}
        if($numUnreadMail == 7){ echo '<img src="../images/global/mail_imgs/inbox_7.png" width="22" height="15" />';}
        if($numUnreadMail == 8){ echo '<img src="../images/global/mail_imgs/inbox_8.png" width="22" height="15" />';}
        if($numUnreadMail == 9){ echo '<img src="../images/global/mail_imgs/inbox_9.png" width="22" height="15" />';}
        if($numUnreadMail == 10){ echo '<img src="../images/global/mail_imgs/inbox_10.png" width="22" height="15" />';}
        if($numUnreadMail == 11){ echo '<img src="../images/global/mail_imgs/inbox_11.png" width="22" height="15" />';}
        if($numUnreadMail == 12){ echo '<img src="../images/global/mail_imgs/inbox_12.png" width="22" height="15" />';}
        if($numUnreadMail == 13){ echo '<img src="../images/global/mail_imgs/inbox_13.png" width="22" height="15" />';}
        if($numUnreadMail == 14){ echo '<img src="../images/global/mail_imgs/inbox_14.png" width="22" height="15" />';}
        if($numUnreadMail == 15){ echo '<img src="../images/global/mail_imgs/inbox_15.png" width="22" height="15" />';}
        if($numUnreadMail == 16){ echo '<img src="../images/global/mail_imgs/inbox_16.png" width="22" height="15" />';}
        if($numUnreadMail == 17){ echo '<img src="../images/global/mail_imgs/inbox_17.png" width="22" height="15" />';}
        if($numUnreadMail == 18){ echo '<img src="../images/global/mail_imgs/inbox_18.png" width="22" height="15" />';}
        if($numUnreadMail == 19){ echo '<img src="../images/global/mail_imgs/inbox_19.png" width="22" height="15" />';}
        if($numUnreadMail == 20){ echo '<img src="../images/global/mail_imgs/inbox_20.png" width="22" height="15" />';}

        //Middle Section
        echo '</a>
        <div id="m1" 
            onmouseover="mcancelclosetime()" 
            onmouseout="mclosetime()">';
            if($session->isAdmin()){ echo '<a href="http://localhost/admin/admin_mailinbox.php">View Inbox&nbsp;';}
            else{ echo '<a href="http://localhost/mailinbox.php">View Inbox&nbsp;';}
        
        //Displays the correct number on drop tab
        if($numUnreadMail == 0){ echo '&nbsp;';}
        if($numUnreadMail == 1){ echo '(01)';}
        if($numUnreadMail == 2){ echo '(02)';}
        if($numUnreadMail == 3){ echo '(03)';}
        if($numUnreadMail == 4){ echo '(04)';}
        if($numUnreadMail == 5){ echo '(05)';}
        if($numUnreadMail == 6){ echo '(06)';}
        if($numUnreadMail == 7){ echo '(07)';}
        if($numUnreadMail == 8){ echo '(08)';}
        if($numUnreadMail == 9){ echo '(09)';}
        if($numUnreadMail == 10){ echo '(10)';}
        if($numUnreadMail == 11){ echo '(11)';}
        if($numUnreadMail == 12){ echo '(12)';}
        if($numUnreadMail == 13){ echo '(13)';}
        if($numUnreadMail == 14){ echo '(14)';}
        if($numUnreadMail == 15){ echo '(15)';}
        if($numUnreadMail == 16){ echo '(16)';}
        if($numUnreadMail == 17){ echo '(17)';}
        if($numUnreadMail == 18){ echo '(18)';}
        if($numUnreadMail == 19){ echo '(19)';}
        if($numUnreadMail == 20){ echo '(20)';}
        ?>

which displays in this navigation:
<li><a href="#"
onmouseover="mopen('m1')"
onmouseout="mclosetime()"
class="link_image">
<?php
include_once('../include/mailicon_codes.php');
?>
</a>

I wondered how or if it is even possible to use javascript to execute the first .php code so that the user would know if he/she had a new message without refreshing the page?

Any help is greatly appreciated as i suck at .js

cheers, Callum

FF, Safari, Opera all execute this javascript code to refresh the page properly, but in IE version 8.0.6001.18904 the page doesn't seem to refresh on click of orange_refresh button. I have checked out a different version of IE8, don't recall exact version, but it did seem to work fine in that one, whatever version it was probably the latest now that I think of it. Check out code below any sug.'s could be helpful, though its probably a bug..
Code:

<a href="javascript:document.location.reload();"
onmouseover="window.status='Refresh'; return true"
onmouseout="window.status='Page Refreshed'"><img src="image/orange_refresh.png" 
width="30" height="30" border="0" /></a>

I am wondering if its possible to execute a JavaScript script as soon as the page is loaded? Perhaps a generic execution?
I tried this, but it didn't work:
Code:

<SCRIPT type="text/javascript">
	if (document.forms["form"]["quantitym"].value > '.$row['sizem'].') {
		alert ("The quantity for product $row['id'] is no longer available.");
	}
</SCRIPT>

<FORM action="updatecart.html" method="post" name="form">
	<DIV>
		<B>Medium:</B> <INPUT name="quantitym" value="'.$content['sizem'].'">
	</DIV>
</FORM>

This is for my shopping cart system. The idea is, the customer might have 4 items in his cart, but whilst he was shopping, someone might of bought the same item, result in only 3 being available, but his cart still says 4.

My solution to this is to make a script run through out his shopping when ever the cart items are listed and just prior payment execution, if the quantity he wants is no longer available, he will be alerted.

$row['sizem'] is PHP drawing how many items there are from my stock database. If the value of the INPUT exceeds this availability, JavaScript shall alert.

Does anyone know why it isn't alerting?

Hi, I'm doing something wrong, I want my script to execute when the browser window opens, can someone please help me?

Code:

<p><iframe id="myFrame" style="display: none;" width="500" height="300"></iframe>
<script type="text/javascript">// <![CDATA[
    window.onload=openpdf();
    type="text/javascript">// <![CDATA[
        function openPdf()
        {
            var omyFrame = document.getElementById("myFrame");
            omyFrame.style.display="block";
            omyFrame.src = "myFile.pdf";
        }
        // ]]></script>

I wish to change the dynamic text in a javascript to that which is in a MySQL database using PHP. this is then used in a flash scroller.

currently i have hard coded the text in the javascript file.

is there a way to have PHP run in the javascript file before it is sent to the endusers?

or another way ?