function playfrom(file, obj, sec) {
    eval("s"+obj+".addVariable(\"file\", \""+file+"\");");
    eval("s"+obj+".addVariable(\"bufferlength\", \"10\");");
    eval("s"+obj+".addVariable(\"http.startparam\", \"start\");");
    eval("s"+obj+".addVariable(\"start\", \""+sec+"\");");
    eval("s"+obj+".addVariable(\"provider\", \"http\");");
    eval("s"+obj+".addVariable(\"autostart\", \"true\");");
    eval("s"+obj+".write(\"player"+obj+"\");");
}