getDocumentBase() in DemoLayer

Hi all,

i hv manged to set up a vehicle tracking system which takes the co-ordinate data from a text file.
Now i have decided to follow that each vehicle will have its own text file and will be called based
on the servlet request preceding this applet. For this purpose i have modified the DemoLayer
class, and now i need to get the documentBase of this applet. But i dont seem to get the way
i am supposed to proceed in this. i tried using getDocumentbase() in DemoLayer, but i get
errors that this is not a valid method..
Can somebody help me with this.
In short i need to access the url with which this applet is called in the DemoLayer class.
And then i will modify the url to load my url file to feed th elatlong points..

thanx in adv
anoop

P.S. Don, thanks to ur help, i finally managed to get my own maps to be displayed .. as u said this
was a bounds problem which in some cases were 7 digit long figures.. But is this a limitation or is it
 a problem with the data that i had..becoz most of the maps i hv, have the same huge bounds..
basicallu these are tab files which i convert into shape files.

rgds,
anoop

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