javascript pass variable to url

I am trying to pass a simple variable to url but for some reason it is not working. Am I missing something?

function myFunction() {
    var x = "img_tree.png";
    document.body.style.backgroundColor = "#f3f3f3";
    document.body.style.backgroundImage = 'url(x)';
}

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LVL 21
MazdajaiAsked:
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ZvonkoSystems architectCommented:
No, that I cannot explain.
But I can explain you this:
"url('"+x+"')";

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In JavaScript that are three Strings concatinated to one string value.
In the resulting string value is the middle part enclosed by single quotes and the middle part is comming from variable with the name: x

Is that explanation suitable for you?
1
 
ZvonkoSystems architectCommented:
Check this:
function myFunction() {
    var x = "img_tree.png";
    document.body.style.backgroundColor = "#f3f3f3";
    document.body.style.backgroundImage = "url('"+x+"')";
}

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And that script does not PASS anything to URL.
The script does set the background image to a image file denoted by the url parameter:
http://www.w3schools.com/jsref/prop_style_backgroundimage.asp
0
 
MazdajaiAuthor Commented:
Thanks. Can you explain this?

 '"+x+"'

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