RES: [PHP] REMOTE SCRIPTING - RSexec() DOUBT

Hi list members, I'm trying to develop a script that work like the MS jscript function called RSexec () (Remote Script execute). During this develop, I'm having a doubt regarding the use of that function RSexec(), cause I was reading about it, and every reference points do use it with ASP (active server pages). My doubt is: Anyone ever used it with PHP? Is it possible? Anyone know any alternative function in Javascript or another solution to archive the same effect as the RSexec() ? The scene is something like: I have two select dropdown list boxes, the first one is MARK and the other one is MODELS. The first contain all the MARKS...and the second is EMPTY...waiting for the MARK to be select to query a Database and get the results. So, when I select the MARK, the MODELS box value became WAIT... and the query start...So, after the results arrive, the models box get all the respective values. So, everything happen without refreshing the screen. It's a very powerfull function...and don't work in Netscape... Thanks for your attention! Thanks for any ideas! Best Regards, Felipe Moreno