i seem to be having some trouble using fopen with javascript, it says object expected

fh = fopen('mapdata.txt', "r");
if(fh!=-1)
{
str = fread(fh, 10000);
fclose(fh);
myZ.innerHTML = str;
}

And does "mapdata.txt" exist on the client machine??

yes and its in the same folder as the webpage

How do you know where the webpage is ON THE CLIENT MACHINE??

my computer is acting as a server and im testing it from here,
but isnt fopen used to read something on the server to begin with?

I'm confused. fopen() as I know it is a PHP function, and it doesn't exist in my Firefox browser. You do know that JavaScript isn't meant to read and write to files, right? Even if this is some sort of extension that it allows it to work on your computer, you won't ever be able to use it for a public site.

Where are you getting information about this?

google, and i abbadon the idea, im just going to link it to a php page read/write it there redirect it back to my page read it with php then convert the string to javascript