www.texture [url to call from external source]...Please help

I have used this simple script on a plane to show the image from the respective url

// Get the latest webcam shot from outside “Friday’s” in Times Square
var url = “http://images.earthcam.com/ec_metros/ourcams/fridays.jpg”;
function Start () {
// Start a download of the given URL
var www : WWW = new WWW (url);

// Wait for download to complete
yield www;

// assign texture
renderer.material.mainTexture = www.texture;
}

i want to change the url from runtime webplayer , what i want to do is , i want this url to be called in an xml which is kept along with the webplayer in the same folder…

any 1 please guide me with step by step code…i wont be able to do this with directions but i wanna learn

any suggesstions plz ?

If you what to call a url in an XML file , then it is upto XML script and Unity script has nothing to do with that… Try some XML forums…