I need a script that can verify if a link is on a certain page. Please read all details before answering, Thx!

Here is the deal:

1) Visitor comes to my link site and chooses a category where he/she thought they submitted a link to, but doesn't bother checking if it is on that page.
2) The person decides they want to update their link with new information and click on the UPDATE YOUR LINK button on the top of the page.
3) They enter in the URL of the link they want to edit.
4) *Here is where I need the cgi or perl, or javascript code) The form they entered the url into checks ONLY the page they are currently on to see if the link is there. If YES, it allows them to edit the link, showing them a form that is pre-filled with the data from the url they entered. (url name, description...) and they can submit the changes to me.
If NO, it tells them that their link is NOT on this page, and please go to the correct page to update the ad.

If you know of a script like this, PLEASE let me know asap, email me if you have to, but I need this asap. Thank you in advance!

getElementsByTagName('a') will return an array of all anchor elements in the page. Compare the href attributes of those items to the requested url until you find a match or fail.

<html>
<head>

<script>
function get(eid) {
var d = document;
var r = d.getElementById(eid);
return r;
}

function update() {
var isInPage = false;
var link = get('link').value;
var d = document;
var links =
d.getElementsByTagName('a');
var last = links.length;
for (var i = 0; i < last; i++) {
isInPage = link == links[i].href;
if (isInPage) break;
}
if (isInPage) {
// do submit
alert('link is in page');
}
else {
// do error process
alert('link is NOT in page');
}
}
</script>
</head>
<body>
<p>
<a href="http://www.d.org/link1.html">
text for link 1</a>
</p>
<p>
<a href="http://www.d.org/link2.html">
text for link 2</a>
</p>
<p>
<a href="http://www.d.org/link3.html">
text for link 3</a>
</p>
<p>
<a href="http://www.d.org/link4.html">
text for link 4</a>
</p>
<form>
Enter link to update:
<input type="text" id="link" />
<input type="button"
value="submit change"
onclick="update();" />
</form>
</body>
</html>

I don't have a script for you, but I have an idea on how to do it. Basically, the <a href> needs to be named. Then, the <a href = <% userlink %>. The value needs to be linked to userlink, but the default of the userlink is what ever you set it to. If I had more time, I'd attempt the script for you, but I gotta goto work soon.

I'm not sure if it will help you but try this.
On the page that suppose to be the link, you can enclose the link with a html tag, maybe div, and then look if this tag has a link or not just with the string's length.

You're allowing users to edit the page directly - bad idea.

The links should be in a database, with the page being created dynamically, so that the "link" can be checked for validity.

If the user wants to edit the link, he merely edits the database entry. Finding whether the link exists (in the database) then becomes trivial - the count of that link in the database is 1. If it's 0, the link doesn't exist in the database. (Check for SQL injection, of course.)

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