Changing Logos on PO

I am attempting to cause the logos to change on a PO. I input the following:

<?xdoxslt:set_variable($_XDOCTX, 'HyTecOrgId', 94787)?>

<?if://SHIP_TO_LOCATION_ID=xdoxslt:get_variable($_XDOCTX, 'HyTecOrgId')?>  Logo.gif <?end if?>

<?if://SHIP_TO_LOCATION_ID!=xdoxslt:get_variable($_XDOCTX,  'HyTecOrgId')?>  Logo.gif <?end if?>

It works fine when I want the second logo, but when I attempt to get only the HyTec logo, I get both logos. I've looked through the manual and the forum and tried a lot of solutions, but I always end up with two logos when I attempt to use the HyTec Ship To ID. I am not very experienced with xml which is probably the main cause of the problem. I was able to get this to work on invoices, quotes, job travelers, etc, but the PO does not seem to want to cooperate. Any help would be greatly