My web site uses google maps
and i'm simply showing the map with some markers for a search results we are stil in beta so only employees know where the site is, so there is not much traffic.
what happens when the page is called we do a search then render the page in js we build the marker to be added but ...
sometimes we get the error 503 when trying to load the map with this content
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>Sorry...</title>
<style>body { font-family: verdana, arial, sans-serif; background-color: #fff; color: #000; }</style>
</head>
<body>
<div><table>
<tr><td><b><font face=times color=#0039b6 size=10>G</font><font face=times color=#c41200 size=10>o</font><font face=times color=#f3c518 size=10>o</font><font face=times color=#0039b6 size=10>g</font><font face=times color=#30a72f size=10>l</font><font face=times color=#c41200 size=10>e</font></b></td>
<td style="text-align: left; vertical-align: bottom; padding-bottom: 15px; width: 50%">
<div style="border-bottom: 1px solid #dfdfdf;">Sorry...</div></td></tr>
</table></div>
<div style="margin-left: 4em;">
<h1>We're sorry...</h1>
<p>... but your computer or network may be sending automated queries.
To protect our users, we can't process your request right now.
</p>
<form action="Captcha" method="get">
<input type="hidden" name="continue" value="http://maps.google.com/maps?file=api&apikey [blablabla]">
<input type="hidden" name="id" value="928[blablabla]6">
<table cellpadding="4" cellspacing="0" border="0">
<tr><td valign="top" align="left">
<font color="#aa1002">
<b>To continue searching, please type the characters you see below:</b>
</font>
<input type="text" name="captcha" value="" id="captcha" size="12">
<input type="submit" name="submit" value="I'm human!">
</td></tr>
<tr><td>
<div align="right">
<img src="/sorry/image?id=928671[blablabla]6&hl=en" border="1" alt="Please enable images on your browser.">
</div></td></tr>
</table>
</form>
</div>
<div style="margin-left: 4em;">
See <a href="http://www.google.com/support/bin/answer.py?answer=86640">Google Help</a> for more information.<br/><br/></div>
<div style="text-align: center; border-top: 1px solid #dfdfdf;">
© 2009 Google - <a href="http://www.google.com">Google Home</a>
</div>
</body>
</html>
what could be causing it ?