Try setting it a little differently. Use the following code and see if you have any results.
HTML
<a class="loadlink" href="canyou.php">Can you help us</a>
JQuery
<html> <head><title>can you</title></head> <body> <div id="content">This is the only content we want returned...</div> </body> </html>
EDIT
If canyou.php contains a complete html skeleton with <html> and <body> tags, then you should have jQuery to parse only the HTML code you want from this page and drop the rest (you don't want to drag <html> or <body> in your #maincont div). You can use jQuery by adding a space, then a selector after the URL parameter in the load () method. Here is an example HTML:
<html> <head><title>can you</title></head> <body> <div id="content"> This is the only content we want returned... </div> </body> </html>
The new download call will look like this:
$('#maincont').load($(this).attr('href') + ' #content');
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