ok alchymyth, thanx for your help, really , dont know other place to learn this stuff !
so i changed the number from 1000 to 4, and also change my page number to portfolio.php .. also change the template name from category-portfolio to `Template Name: portfolio
and added the pagination code at the end
but now my background works but the posts from my category called "portfolio" disapeared ..
thats the problem, and thats why i thought i should call this page category-portfolio ... because i need to show the posts from this category in this page..
it would help me a lot now know how is the correct way to show my posts from category "portfolio" and background, pagination, etc , without mess with the wordpress template hierarchy using the name category-portfolio.php .. just need to know that hehe
i have some problem to understand correctly this wordpress texts about their structure and how it works... im not a professional programmer and also my english is little poor .. i understand the text but it dont give me ideia about how to put this in the codes ...
thanx for your help