Can i use a webview with exclusively remote content (loading from a php site)?

First, a disclaimer: i'm completely new to iphone, android or any mobile development. In the other side, i've been developing websites (php, javascript) for long time.

I have a website which is adapted for mobile and works great. But, there are some features i need such as prevent the screen from dimming (my site is designed to be used for many hours without user interaction while being permanently visible or for example being able to send notifications (with sound, etc., to attract user attention.

This has lead me to consider a webview. From what i've seen, it's about creating a native app which just a webview (browser without toolbars) and using html and javascript to operate. It will use some native functions to perform some native actions (such as the ones i want).

I've searched around and i don't have a specific response to this: can i tell a webview to, permanently load the content from a remote site? I mean, my site is php based (zend), with many jquery content manipulation. Can i tell him something like LOAD htp://www.mysyite.com and let him do everything else from it? Absolutely no local content applies, everything is remote. The webview would just be an "interface" to the website.

And additional question is: can i use jquery on it? Ajax calls? Geolocation? I mean, in a browser i can, i just wonder if inside a webview i can.

I've read that phonegap does this. But most of the time, when taking about phonegap and about webview i general, i read people talking about loading locally the page not remotely in a permanent basis.

Finally, yes, i will build a native app in the future. But now, i simply don't have time to learn about android, ios and blackberry at the same time.

You got yourself the answer: Phonegap.

What phonegap does is to load a LOCAL html, that can do ajax calls to REMOTE urls.

Since you seem to have already done ajax, I think you'll get the picture pretty good:

Normal site: html on SITE <- ajax -> php on SITE
compare with:
Phonegap: html on PHONE <- ajax -> php on SITE

Yes, on phonegap you can use jquery, ajax, etc. And have access to phone things like geolocation. Probably you already saw it, but here is the list of javascript API calls that phonegap gives you: http://docs.phonegap.com/en/2.8.0/index.html