if you have a PHP script to display an image then http://www.test.com/showimage.php?1234
should probably read
<myparam> is the name of the parameter in the script that you will assign the image to.
If you are going down that route then its quite feasible not to require the image extension (you could tet for a jpg / JPEG / gif / png etc
however you are doing some more work. the gdlib provides some methods to do this)
if you just want to pull the specified image in then http://www.test.com/1234.jpg should pull in that resource
Within Access however you don't need a script to handle the image. Just cite the url to the resource and assign it to an image control
imgExternalURL is the name of your image control in your access form
"http://www.test.com/images/1234.jpg" is the name of your resource
<myimagecontrol> is the name of your image control in your access form
[mycolumn] is the name of column (field) in your data.
you may prefer to do a load image only when required, rather than every time.
if you choose not to use a bound image control then place your code in the forms on current event and the text box that contains the URL's on change/on lost focus events. OR consoder placing a button to load an image on demand.
if you are using runtime then you will need to be a bit more savvy about error handling and trapping