width(val): If no explicit unit was specified (like "em" or "%") then "px" is concatenated to the value. : width « jQuery « JavaScript Tutorial

<html>
  <head>
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
        
               
                  $("div").one('click', function () {
                      $(this).width(30)
                             .css({cursor:"auto", "background-color":"blue"});
                  });

               


        });
    </script>
<style>

  div { width:50px; height:70px; float:left; margin:5px;
        background:rgb(255,140,0); cursor:pointer; }
  
</style>
  </head>
  <body>
    <body>
          <div></div>
          <div></div>
                 
    </body>
</html>

30.115.width
	30.115.1.	Get width
	30.115.2.	Set width to
	30.115.3.	Set width with function
	30.115.4.	width(): find the width of div
	30.115.5.	width(val): If no explicit unit was specified (like "em" or "%") then "px" is concatenated to the value.