How to send variable on Drop Down Change for AJAX

[tdors]

Below is the code that I have.  I'm not totally familiar with JavaScript, but I'm getting the AJAX portion to work correctly, but how do I send the value of the drop down item selected to the "AJAX Query"?  After "state=changed" I want to add "&xsellid=<The Value ID of the Drop Down>" What is the javascript function for that?

 

Here is the line specifying the Select Statement --> I have the "$toecho .= "\n<select size='1' name='".$selectname."' class='".$dropstyle."' onchange='javascript:  MyAjaxRequest(\"ajmn\",\"/handle_xsmysqllook.php?state=changed\")'>\n";"

 

Please let me know if you need to know anything else/I've left anything out.

 

function xselldropchange($selectname, $valueselected, $dropstyle)
#	$selectname - Name of the drop down box/"<Select>" to use
#	$valueselected - If specified, which id of the value to display
#	$dropstyle - Style of Dropdown box
#
#	$toecho - HTML Code to Echo Back
#	$detailquery - Query to get information
#
#
{
$toecho = NULL;

# Determine what the mysql query should be	
$dropquery = "SELECT incentive_id, incentive_name FROM incentive_list ORDER BY incentive_sort";

if ($dropquery <> NULL) {

	$dropresult = @mysql_query ($dropquery); // Run the query
	if ($dropresult) { // If this query ran okay

		$toecho .= "\n<select size='1' name='".$selectname."' class='".$dropstyle."' onchange='javascript:  MyAjaxRequest(\"ajmn\",\"/handle_xsmysqllook.php?state=changed\")'>\n";

		while ($detailrow = mysql_fetch_array($dropresult, MYSQL_NUM)) {

			$toecho .= "<option "; if ($detailrow[0] == $valueselected) {$toecho .= "selected ";} $toecho .= "value='".$detailrow[0]."'>".$detailrow[1]."</option>\n";

		}

		$toecho .= "</select>\n";

		mysql_free_result ($dropresult); // Free up the result (Good Practice)

	} else { // If Query was Null
	$toecho == "<select size='1' name='problem'><option value='0'>No Result $table query $dropquery</option></select>";
	}
} else { // If Query was Null
$toecho == "<select size='1' name='problem'><option value='0'>ERROR IN $table</option></select>";
}

return $toecho;
}