void popContext() throws ScriptException {
		if (scriptLevel == 0)
			evalError("RasMol virtual machine error - stack underflow");
		Context context = stack[--scriptLevel];
		stack[scriptLevel] = null;
		filename = context.filename;
		script = context.script;
		linenumbers = context.linenumbers;
		lineIndices = context.lineIndices;
		aatoken = context.aatoken;
		pc = context.pc;
	}