Image page using using up memory

Hello everyone. I have a site which has a lot of photos. I recently implemented an option for people to choose a width and compression that these photos are displayed in (so people don't complain about the speed etc..). After a while of this code running - i've been noticing my server (W2k running IIS) constantly using up all it's memory - and I presume it's because of the image page i'm using - not releasing it's info. If some expert could take a look at the code - and recommend any changes - I would be most appreciated! Attached below is the code I have written, I hope it is understandable... Outlook Express does some dumb things to code when it is pasted into a msg! <? $d = addslashes($d); //the dir where the picture is $i1 = addslashes("$d/$i"); //the source of the picture - inc dir $i2 = substr($i,0,strlen($i)-4); //make a new variable - same as $i but without the .jpg $i2 = addslashes("$d/pre/$i2 w $w c $c.jpg"); //pointing to where the new image would be if it was already created if(file_exists($i2)){ //if the compression and width has already been saved then use the existing one Imagejpeg(imagecreatefromjpeg($i2)); } else { //otherwise create a new image and save it to the 'pre' directory $size = GetImageSize($i1); $im_in = imagecreatefromjpeg($i1); $proportion = $size[0] / $w; $im_out = ImageCreate($w, $size[1] / $proportion); ImageCopyResized($im_out, $im_in, 0, 0, 0, 0, $w, $size[1] / $proportion, $size[0], $size[1]); Imagejpeg($im_out,$i2,$c); Imagejpeg($im_out,'',$c); ImageDestroy($im_in); ImageDestroy($im_out); } ?>