change background image for a button

I have 2 frames for my page upper_frame.html and lower_frame.html

in lower_frame.html I have a button with background as back.bmp , clicking on which I change the html content in upper_frame.html. I want to add code to change the background of the button after it is clicked to front.bmp.

here is my cuurent code


<SCRIPT language="JavaScript">

function change_overview()


<button name="overview" style="background-image:url(back.bmp)" onclick="javascript:change_overview()"><font color="#FFFFFF">Product Overview</font>
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Pratima PharandeCommented:
<button name="overview" style="background-image:url(back.bmp)" onclick="javascript:change_overview()" id="btnOverview" >
function change_overview()
var elm = document.GetElementById("btnOverview"); = "url(front.bmp)"
ZvonkoSystems architectCommented:
I would change it to this:

<input type="button" name="overview" style="background-image:url(back.bmp)" onclick="changeOverview(this)" >

<!-- remove </button>

function changeOverview(theBtn){
  parent.upper_frame.location="demo.html"; = "url(front.bmp)"; // no dash, Uppercase letter.

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ZvonkoSystems architectCommented:
The comment http:#20175514 contains a commen wrong assumption about syntax of style attributes in JavaScript. Therefore I would not add that comment to PAQ to increase the confusion.
My proposal:

Accept:  Zvonko {http:#20175714}

Forced accept.

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