Javascript fade in fade out without Jquery and CSS3

Question

I am really squeezing my head to make the simple fade in and fade out of the background image work only with javascript without JQuery and CSS3. I know how easy is to call a

Answer 1

element.style is undefined because you're not referencing the correct object. Use element[0] for your function call:

function handleClick(evt){     
    var element = document.getElementsByClassName(evt.target.id);
    fade(element[0]);        
}

Fiddle

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Side note: Using console.log() and some type of developer console (like the one included in Chrome) can work wonders for debugging.