i need help with php script image+text upload to a page by visitors of my site

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now i got 1 massive script and i hope u can just point to me what it is i should be looking for. i need a form for visitors to upload image (if more than 1, the script can make it in a thumbnail) and also the form also have fields for the user to put a description on it. when they uploaded the images and text, it must and can be viewed openly by other visitors. here is a sample web that im trying to copy

http://www2.mudah.my/ai/form/0?ca=13_s

as u can see, when a person uploaded their ads there, others can search their upload using its search engine (the serch engine i got from youtube and the web dont display images) and when a person click on a certain ads, it will be shown in a single page for example


http://www.mudah.my/2005+Toyota+Wish+2+0L-7295889.htm

and search engine should look like this

http://www.mudah.my/Sarawak/for-sale


those are just a sample what im trying to do.

ofc im not asking for u to write a script or do tutorials on this (tho doin so is apreciated :P )
i just need to know the "terms" of the script tat i should be researching, names' etc.


thx