i am using php to upload images onto the server and then they are being displayed on other pages around the site. the problem i am having is if the user changes the images that they have uploaded the old ones are displaying from the cache.

i would like to know if it is possible to get the image from the server and then add a random number to it so that the cached images will always have a different number appended to the end of the file when of the image when displayed.

i dont want the random number stored with the file i only want it to be used when the file is being displayed.

i have tried to store the image with the random number and then post the variable holding this number to other pages from the image upload form but this has not worked. the variable is not getting posted so i can only get the rest of the file name when i look at the image properties.