Андрей Буров

element.style.backgroundColor = "hsl(0,100%,50%)";

Это ищите?eval(data)

Добавьте к LI tabindex
jsfiddle.net/mc4tN/2

ffpmeg / mencoder

var Obj = {}
Obj.callbackName = function () {
}

Obj.doSomething = function () {
  asyncMethod(..., Obj.callbackName);
}

У них другой mime
.ppt application/vnd.ms-powerpoint
.pot application/vnd.ms-powerpoint
.pps application/vnd.ms-powerpoint
.ppa application/vnd.ms-powerpoint
.pptx application/vnd.openxmlformats-officedocument.presentationml.presentation
.potx application/vnd.openxmlformats-officedocument.presentationml.template
.ppsx application/vnd.openxmlformats-officedocument.presentationml.slideshow
.ppam application/vnd.ms-powerpoint.addin.macroEnabled.12
.pptm application/vnd.ms-powerpoint.presentation.macroEnabled.12
.potm application/vnd.ms-powerpoint.template.macroEnabled.12
.ppsm application/vnd.ms-powerpoint.slideshow.macroEnabled.12

session_start видимо забыли

st1 === st2

Math.ceil возвращает округленное значение

s = Math.ceil(s);