image manager little change for better

hi , i want to make some little changes in style on window file manager, but when try to search a code who need to change i have not success. in furebug i found the code but there have not info from which file this code came in
in the original version of OC working fine but when i upload a other module >> ImageManager+[WoahEdition]OC1.5.6.x-Fixed http://www.opencart.com/index.php?route ... _license=0 , the window show bad buttons and other functions of module. i still can work but is dificult for my mates to work . in fire bug can change values , but where i can change in some file to be fine for every time when using to upload pictures for products and banners ?
here is :

element.style {
display: block;
height: auto;
left: 479px;
outline: 0 none;
top: 120px;
width: 700px;
z-index: 1001;

when change width and some other options the view is well, but is not have info from which *.css or other file this code is write. please contact me at email : info@karadev.net or here for more info to send screenshots and other communication , best regards kaloyan radev. i am using 22'' monitor and is not problem for me or my colleges to make some little changes in this file managers , thank you again before helping me.
add some screenshots to view how it work. if have some problems for admins of forum, please let me know i will edit the post.

best regards kaloyan radev