Question on some javascript function…pls help

[B]1. When does div.setAttribute(”###”) not equal div.###?[/B]

[B]2. What’s the difference between these two statements:[/B]

a. var x = 3;
b. x = 3;

[B]3. What’s the difference between:[/B]

a. !!(obj1 && obj2)
b. (obj1 && obj2)

[B]4. Write a one-line piece of JavaScript code that concatenates all strings passed into a function:[/B]

function concatenate(/*any number of strings*/) {

var string = /*your one line here*/
return string;
}

[B]5. What do these two examples have in common?[/B]

Example 1:

var obj = document.getElementById(’adiv’);
document.getElementById(’adiv’).ptr = obj;

Example 2:

function assignClick() {
var el = document.createElement(’div’);

function handleClick() {
el.innerHTML = ‘clicked!’;
}

el.attachEvent(”onclick”, handleClick);
}

pls help, thanks !

regards,
Cut carbon emmision!

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