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professional-javascript-10-AccessingStyleSheetsExample3.htm / htm

          <title>Accessing Style Sheets Example</title>
          <style type="text/css">
              div.special {
                  background-color: red;
                  height: 10px;
                  width: 10px;
                  margin: 10px;
          <script type="text/javascript">
              function changeBackgroundColor() {
                  var oCSSRules = document.styleSheets[0].cssRules || document.styleSheets[0].rules;
                  oCSSRules[0].style.backgroundColor = "blue";
          <div id="div1" class="special"></div>
          <div id="div2" class="special"></div>
          <div id="div3" class="special"></div>
          <input type="button" value="Change Background Color" onclick="changeBackgroundColor()" />

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