give this a try.
Code:
<form id="form1" method="POST">
<input id="l" name="l" size="45" type="text" value="book">
<input id="submit" name="submit" value="save" type="submit">
</form>
<script>
$('#form1').submit(function(event){
event.preventDefault();
var formdata= $(this).serialize();
var carturl = '/content/pages/cart.php';
$.ajax({
type: "POST",
url : carturl,
data: formdata,
success: function(msg){
$("#contentmainpane").html(msg);
}
});
});
</script>