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TextField requests focus

< html> <head> <title>Set Form focus</title> <script type="text/javascript" language="javascript"> <!-- // function SetFocus(){     document.SimpleForm.FirstInput.focus(); } function FindMaxAndMin(){         SetFocus(); } // --> </script> </head> <body onload="SetFocus()"> <form name="SimpleForm"> <table> <tr>  <td width="25%" align="right">Enter first number:</td>  <td><input name="FirstInput" type="text"></td> </tr> <tr>  <td width="25%" align="right">Enter second number:</td>  <td><input name="SecondInput" type="text"></td> </tr> <tr>  <td width="25%" align="right">Enter third number:</td>  <td><input name="ThirdInput" type="text"></td> </tr> <tr>  <td width="25%" align="right">&nbsp;</td>  <td><button type="Button" onclick="FindMaxAndMin()"> Click to calculate</button></td> </tr> </table> </form> </body> </html>