AJAX post returning 500 Internal Server Error on Live Server

[amskape]

I created a script where a user can select from a variety of
shipping options for an order from within a jQuery dialog box. The
shipping rates are delivered via UPS & FedEx. Oddly enough, the
script works fine on my development machine, but on the live server,
Firebug returns a "500 Internal Server Error"

Here is what my jQuery looks like:

jQuery("#select-shipping").click(function(){
// Open the dialog, start with the "loading page"
		

$("#shipping-select").load('func/shipping_load.php').dialog({
			bgiframe: true,
			autoOpen: true,
			position: 'center',
			title: 'Select Shipping Method',
			width: 400,
			height: 400,
			modal: true,
			buttons: {
				'Apply Shipping': function() {
					var bValid = true;
					
					if (bValid) {
						var fship	=	

$('input[name=shipping]:checked').val();
						var arr = 

fship.split('-');
						var shipPrice 	=	

arr[1];
						var shipMeth 	=	

arr[0];
						
						var subOrder 	=	

$("#d_total").val();
						if 

($('#customer-discount').val() != 'false') {
							var minDis = 

subOrder * ("."+$("#customer-discount").val());
							var nTotal = 

subOrder - minDis;
					
							var orderTotal 

= nTotal + parseFloat(shipPrice) + parseFloat($("#tax").val());  /* 

Order Total minus customer discount */
							
							

$("#order_discount_amount").val("-"+minDis.toFixed(2));
						}
						else {
							var orderTotal 

= parseFloat(subOrder) + parseFloat(shipPrice) + 

parseFloat($("#tax").val());	/* Order Total, No Discount */
						}
						

$("#order_total").val(orderTotal.toFixed(2)),
						

$("#shipcost").val(parseFloat(shipPrice)),
						

$("#shipping_method").html(shipMeth);
						
						

$(this).dialog("destroy");
					}
				},
				'Close Window': function() {
					$(this).dialog("destroy");
					
				}
			},
			close: function() {
				$(this).dialog("destroy");
			}
		});
		
		// This portion actually runs the PHP code to get the 

rate results from UPS & FedEx
		$.ajax({
   			type: "POST",
   			url: "func/shipping_selection.php",
			data: "shipid=" + $("#customer-ship-id").val() 

+ "&cartid=" + $("#cart_id").val(),
			success: function(html){
				$('#sLoader').fadeOut("fast");
				$("#sLookup").html(html);
			}
 		});
		
	});

The dialog opens a loader page (with gif) and that portion works fine.
Once the AJAX post is complete (shipping_selec tion.php), it is
supposed to update the "sLookup" div with the HTML from the
shipping_select ion.php page. Like I said, it works perfectly on my
testing server, but fails on the live server. Both are running PHP

5.2xxxx.

Also, notice in the attached images that the 'shipping_selec tion.php'
is actually working...rate results are returned from both UPS and
FedEx, however something is failing on the AJAX success function.

[dgreenhouse]

If you're getting a 5xx error, then, something's going wrong in the script. Bracket (comment out) code segments and selectively enable various sections until you locate the error. Create a test page that just displays the returned results in a div.

[perhapscwk]

all post variable with some special character in script need to replaced by xxx

url = url.replace(/#/g, '%23').replace(/"/g, '%27').replace(/!/g, '%21').replace(/\(/g, '%28').replace(/\)/g, '%29').replace(/\*/g, '%2A').replace(/\+/g, '%2B').replace(/~/g, '%7E');