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Trim dijit form TextBox

< html>   <head>     <link rel="StyleSheet" type="text/css" href="js/dojo/dijit/themes/tundra/tundra.css">     <script type="text/javascript">       var djConfig = {         baseScriptUri : "js/dojo/",         parseOnLoad : true       };     </script>     <script type="text/javascript" src="js/dojo/dojo/dojo.js"></script>     <script>             dojo.require("dojo.parser");             dojo.require("dijit.form.TextBox");             function help() {                 var msg="Help";                 alert(msg);                 return false;             }             function validate(){                 var f = document.getElementById("registration_form");                 if (f.first.value == "" ||f.last.value == "" ||f.email.value == "") {                         alert("All fields are required.");                         return false;                 }                 return true;             }     </script>   </head>   <body class="tundra">       <form id="registration_form"             onsubmit="javascript:return validate()"             action="">             First Name:<input dojoType="dijit.form.TextBox" propercase=true trim=true name="first"><br>             Last Name:<input dojoType="dijit.form.TextBox" propercase=true trim=true name="last"><br>             Your Email:<input dojoType="dijit.form.TextBox" length=25 name="email"><br>             <button type="submit">Sign Up!</button>             <button type="reset">Reset</button>             <button type="button" onclick="javascript:help()">Help</button>       </form> </body> </html>