Hey there, just a basic question.....just wondering how i would delete a certain portion of an XML file w/ asp or php...

i wanna do a news section for a band website, and they wanna be able to add news stories on the backend...so i figure i have a pHP or asp backend that appends to the XML file...and then a for/in loop in flash that reads the data and iterates through it creating dupicate movie clips and what not for the news section...so if theres 20 records, there will be 20 rows.....30 records...30 rows. what is the easiest way to delete certain portions of like a news.xml file?

thanks!