Script execution

Hi everybody. The "problem" that I'm having is probably because I've got more of a Windows background -- and it isn't so much a problem as a point of curiosity. I've recently noticed that when I write a script that they seem to have different permissions when executed at the command line. Two that I have written recently run just fine when you execute 'php scriptname.php' but they are unable, at least, to write the data if I browse to them on localhost. Am I imagining things? If not, how would I properly make them able to run through a browser? Thanks! G