jQuery/Ajax call - It Doesn't work on IE7

Question

i make a Jquery function that (for the moment) call a function dinamically and print it with an alert. with firefox, chrome : it works! when i try on IE7 (the first time), it fails. If i reload the page (F5) and retry , it works! o_O

I FINALLY understand why that's happen. In my old website i used the jquery-1.3.2.min.js library. On this i use the jquery-1.4.2.js and in fact it doesnt work. So what's up? A bug in this new version?

cheers

EDIT

actual functions (with Bryan Waters suggestions):

// html page
<a href="#" onClick="pmNew('1');return false">prova</a>    

// javascript page
function pmNew(mexid) {
    var time = new Date;
    $.ajax({
        type: 'POST',
        cache: false,
        url: './asynch/asynchf.php' + '?dummy=' + time.getTime(),
        data: 'mexid='+escape(mexid)+'&id=pmnew',
        success: function(msg) {
            alert(msg);
        }
    });
    return false;
}

// ajax.php
if($_POST['id']=="pmnew") {
    echo "please, i will just print this";
}

Fiddler result : if i use http://localhost/website fiddler doesnt capture the stream. if i use http://ipv4.fiddler/website it capture the stream, but at the ajax request doesnt appair. if i refresh the page, yes it works. mah...i really don't know how resolve this problem...

Answer 1

Check to make sure the content returned to the DOM is valid for the DOCTYPE specified.

I've had a similiar problem with Chrome, FF and Safari all working just fine, but finding the ajax result broken in IE. Check to make sure you don't have any extra divs or spans in the ajax result breaking your markup.